var datePickerDivID = "datepicker";
var iFrameDivID = "datepickeriframe";
var dayArrayMed = new Array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
var monthArrayLong = new Array('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December');
// these variables define the date formatting we're expecting and outputting.
// If you want to use a different format by default, change the defaultDateSeparator
// and defaultDateFormat variables either here or on your HTML page.
var defaultDateSeparator = "/";        // common values would be "/" or "."
var defaultDateFormat = "mdy"    // valid values are "mdy", "dmy", and "ymd"
var dateSeparator = defaultDateSeparator;
var dateFormat = defaultDateFormat;

document.onclick=checkDatePickerClick;
document.onkeypress = checkDatePickerKey;
if (document.layers) { document.captureEvents(Event.KEYPRESS || Event.CLICK); }

// This is the main function you'll call from the onClick event of a button.
function displayDatePicker(dateFieldName, displayBelowThisObject, dtFormat, dtSep)
{
  //var targetDateField = document.getElementsByName (dateFieldName).item(0);
  var targetDateField = document.getElementById(dateFieldName);
 
  // if we weren't told what node to display the datepicker beneath, just display it
  // beneath the date field we're updating
  if (!displayBelowThisObject)
    displayBelowThisObject = targetDateField;
 
  // if a date separator character was given, update the dateSeparator variable
  if (dtSep)
    dateSeparator = dtSep;
  else
    dateSeparator = defaultDateSeparator;
 
  // if a date format was given, update the dateFormat variable
  if (dtFormat)
    dateFormat = dtFormat;
  else
    dateFormat = defaultDateFormat;
 
  var x = displayBelowThisObject.offsetLeft;
  var y = displayBelowThisObject.offsetTop + displayBelowThisObject.offsetHeight ;
 
  // deal with elements inside tables and such
  var parent = displayBelowThisObject;
  while (parent.offsetParent) {
    parent = parent.offsetParent;
    x += parent.offsetLeft;
    y += parent.offsetTop ;
  }
	// Page introduces other offsets via padding if IE
	var theAgent=navigator.userAgent.toLowerCase();
	if ((theAgent.indexOf('msie') > 0) && (theAgent.indexOf('win') > 0))
	{
		x+=3;
		y+=4;
	}
	else if ((theAgent.indexOf('safari') > 0) && (theAgent.indexOf('mac') > 0))
	{
		y-=6;
	}
  drawDatePicker(targetDateField, x, y);
}


/**
Draw the datepicker object (which is just a table with calendar elements) at the
specified x and y coordinates, using the targetDateField object as the input tag
that will ultimately be populated with a date.

This function will normally be called by the displayDatePicker function.
*/
function drawDatePicker(targetDateField, x, y)
{
  var theBase=targetDateField.id.split('_');
 	var dt = getCompositeDate(theBase[0]);

  // The datepicker table will be drawn inside of a <div> with an ID defined by the
  // global datePickerDivID variable. If such a div doesn't yet exist on the HTML
  // document we're working with, add one.
  if (!document.getElementById(datePickerDivID)) {
    // Don't use innerHTML to update the body, because it can cause global variables
    // that are currently pointing to objects on the page to have bad references
    var newNode = document.createElement("div");
    newNode.setAttribute("id", datePickerDivID);
    newNode.setAttribute("class", "dpDiv");
    newNode.setAttribute("style", "visibility: hidden;");
    document.body.appendChild(newNode);
  }
 
  // Move the datepicker div to the proper x,y coordinate and toggle the visiblity
  var pickerDiv = document.getElementById(datePickerDivID);
  pickerDiv.style.position = "absolute";
  pickerDiv.style.left = x + "px";
  pickerDiv.style.top = y + "px";
  pickerDiv.style.visibility = (pickerDiv.style.visibility == "visible" ? "hidden" : "visible");
  pickerDiv.style.display = (pickerDiv.style.display == "block" ? "none" : "block");
  pickerDiv.style.zIndex = 10000;
 
  // Draw the datepicker table
  refreshDatePicker(targetDateField.id, dt.getFullYear(), dt.getMonth(), dt.getDate());
  
}

// This is the function that actually draws the datepicker calendar.
function refreshDatePicker(dateFieldName, year, month, day)
{
  // if no arguments are passed, use today's date; otherwise, month and year
  // are required (if a day is passed, it will be highlighted later)
  var theField;
  var thisDay = new Date();
	
  if ((month >= 0) && (year > 0)) {
    thisDay = new Date(year, month, 1);
  } else {
    day = thisDay.getDate();
    year = thisDay.getFullYear();
    thisDay.setDate(1);
  }

  // the calendar will be drawn as a table
  // you can customize the table elements with a global CSS style sheet,
  // or by hardcoding style and formatting elements below
  var crlf = "\r\n";
  var TABLE = "<table border='0' cols=7 cellpadding='0' cellspacing='0' class='dpTable'>" + crlf;
  var xTABLE = "</table>" + crlf;
  var TR = "<tr class='dpTR'>";
  var TR_days = "<tr class='dpDayTR'>";
  var TR_todaybutton = "<tr class='dpTodayButtonTR'>";
  var xTR = "</tr>" + crlf;
  var TD = "<td class='dpTD' onMouseOut='this.className=\"dpTD\";' onMouseOver=' this.className=\"dpTDHover\";' ";    // leave this tag open, because we'll be adding an onClick event
  var TD_todaybutton = "<td colspan=7 class='dpTodayButtonTD'>";
  var TD_days = "<td class='dpDayTD'>";
  var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' ";    // leave this tag open, because we'll be adding an onClick event
  var xTD = "</td>" + crlf;
  var DIV_selected = "<div class='dpDayHighlight'>";
  var xDIV = "</div>";
  var html = TABLE;
 

  // this is the title bar, which displays the month and the buttons to
  // go back to a previous month or forward to the next month
 
 // Sam - Date Navigation Replacement Code
 	html += "<tr><td align='center' colspan='7'>";
 	html += "<table border='0' cellpadding='1' cellspacing='0'><tr>";
 	// Month Decrement Button
 	html += "<td>"+getButtonCode(dateFieldName,'dpButton', thisDay, -1, "&lt;");+"</td>";
	// Month Select Menu
  html += "<td><select id='dpMonth' class='dpMonthMenu' onChange=\"refreshDatePicker('" + dateFieldName + "'," + year + ",getSelectedValue(this,1));\";>";
  for(i = 0; i < monthArrayLong.length; i++)
    html += "<option value='"+i+"'>" + monthArrayLong[i] + "</option>";
  html += "</select></td>";
 	// Month Increment Button
 	html += "<td>"+getButtonCode(dateFieldName,'dpButton', thisDay, 1, "&gt;");+"</td>"
 	// Year Field
 	html += "<td><input type='text' id='dateYear' class='dpYearFld' value='"+year+"' maxlength='4'></td>";
	// Up Down Buttons
	html += "<td><table border='0' cellpadding='0' cellspacing='0'>";
	html += "<tr><td>";
	html += getYearButtonCode(dateFieldName,'dpYearButtonUp', thisDay, 1);
	html += "</td></tr>";
	html += "<tr><td>";
	html += getYearButtonCode(dateFieldName,'dpYearButtonDown', thisDay, -1);
	html += "</td></tr>";
	html += "</table></td>";
 	html += "</tr></table>";
 	html += "</td></tr>" 
  
  html += xTR;

  // this is the row that indicates which day of the week we're on
  // Sam
	html += "<tr><td align='center' colspan=7>";
	html += "<table border='0' cellpadding='0' cellspacing='0' class='dpCalTable' width='85%'>"
  html += TR_days;
  for(i = 0; i < dayArrayMed.length; i++)
    html += TD_days + dayArrayMed[i] + xTD;
  html += xTR;
 	
 	// Sam
 	html += "<tr><td colspan='7' style='background-color:black;line-height:1px;font-size:1px;'>.</td></tr>"
 	
  // now we'll start populating the table with days of the month
  html += TR;
 
  // first, the leading blanks
  for (i = 0; i < thisDay.getDay(); i++)
    html += TD + "&nbsp;" + xTD;
 
  // now, the days of the month
  do {
    dayNum = thisDay.getDate();
    //TD_onclick = " onclick=\"updateDateField('" + dateFieldName + "', '" + getDateString(thisDay) + "');\">";
    TD_onclick = " onclick=\"setCompositeDate('" + dateFieldName + "', '" + getDateString(thisDay) + "');\">";
    
    if (dayNum == day)
      html += TD_selected + TD_onclick + DIV_selected + dayNum + xDIV + xTD;
    else
      html += TD + TD_onclick + dayNum + xTD;
    
    // if this is a Saturday, start a new row
    if (thisDay.getDay() == 6)
      html += xTR + TR;
    
    // increment the day
    thisDay.setDate(thisDay.getDate() + 1);
  } while (thisDay.getDate() > 1)
 
  // fill in any trailing blanks
  if (thisDay.getDay() > 0) {
    for (i = 6; i > thisDay.getDay(); i--)
      html += TD + "&nbsp;" + xTD;
  }
  html += xTR;
 	html += "<tr><td colspan='7' style='line-height:4px;font-size:4px;'>&nbsp;</td></tr>"
 	html += "</table></td></tr>"
 	
 	
  // add a button to allow the user to easily return to today, or close the calendar
  var today = new Date();
   // Sam - Add more buttons
  html += TR_todaybutton + TD_todaybutton;
  html += "<span class='dpImgButton'><img src='/datepicker/img/week_ago.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",-7,0,0);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/yesterday.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",-1,0,0);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/week_out.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",7,0,0);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/2_wks_out.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",14,0,0);'></span>";
  html += xTD + xTR;
  
  html += TR_todaybutton + TD_todaybutton;
  html += "<span class='dpImgButton'><img src='/datepicker/img/month_ago.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",0,-1,0);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/today.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",0,0,0);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/month_out.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",0,1,0);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/3_mos_out.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",0,3,0);'></span>";
  html += xTD + xTR;
  
  html += TR_todaybutton + TD_todaybutton;
  html += "<span class='dpImgButton'><img src='/datepicker/img/year_ago.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",0,0,-1);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/tomorrow.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",1,0,0);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/year_out.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",0,0,1);'></span>";
  html += "<span class='dpImgButton'><img src='/datepicker/img/6_mos_out.gif' width='52' height='18' onClick='setOffsetDate(\"" + dateFieldName + "\",0,6,0);'></span>";
  html += xTD + xTR;
 
 
  // and finally, close the table
  html += xTABLE;

 	document.getElementById(datePickerDivID).innerHTML = html;
  // add an "iFrame shim" to allow the datepicker to display above selection lists
  adjustiFrame();
  // Set Menus
  theField=document.getElementById('dateYear');
 	SetMenu(theField,year);
 	theField=document.getElementById('dpMonth');
 	SetMenu(theField,month);
 	try {
 	theField.focus();
	}
	catch (er)
	{}

}

// Convenience function for writing the code for the buttons that bring us back or forward a month.
function getButtonCode(dateFieldName,dateClass, dateVal, adjust, label)
{
  var newMonth = (dateVal.getMonth () + adjust) % 12;
  var newYear = dateVal.getFullYear() + parseInt((dateVal.getMonth() + adjust) / 12);
  if (newMonth < 0) {
    newMonth += 12;
    newYear += -1;
  }
  if (adjust > 0)
  {
  	return "<a class='dpMonthButton' href='javascript:refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'><img border='0' src='/datepicker/img/DatePickerNavRightBtn.gif' width='18' height='18'></a>"
  }
  else
  {
  	return "<a class='dpMonthButton' href='javascript:refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'><img border='0' src='/datepicker/img/DatePickerNavLeftBtn.gif' width='18' height='18'></a>"
  }
  //return "<button class='"+dateClass+"' onClick='refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'>" + label + "</button>";
}

// Convenience function for writing the code for the buttons that bring us back or forward a year.
function getYearButtonCode(dateFieldName,dateClass, dateVal, adjust)
{
  var newMonth = dateVal.getMonth();
  var newYear = dateVal.getFullYear() + adjust;

  if (adjust > 0)
  {
  	return "<a class='dpYearButtonUp' href='javascript:refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'><img border='0' src='/datepicker/img/dpupbtn.gif' width='18' height='9'></a>"
  }
  else
  {
  	return "<a class='dpYearButtonDown' href='javascript:refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'><img border='0' src='/datepicker/img/dpdownbtn.gif' width='18' height='9'></a>"
  }
}

// Convert a JavaScript Date object to a string, based on the dateFormat and dateSeparator
// variables at the beginning of this script library.
function getDateString(dateVal)
{
  var dayString = "00" + dateVal.getDate();
  var monthString = "00" + (dateVal.getMonth()+1);
  dayString = dayString.substring(dayString.length - 2);
  monthString = monthString.substring(monthString.length - 2);
 
  switch (dateFormat) {
    case "dmy" :
      return dayString + dateSeparator + monthString + dateSeparator + dateVal.getFullYear();
    case "ymd" :
      return dateVal.getFullYear() + dateSeparator + monthString + dateSeparator + dayString;
    case "mdy" :
    default :
      return monthString + dateSeparator + dayString + dateSeparator + dateVal.getFullYear();
  }
}

/**
Use an "iFrame shim" to deal with problems where the datepicker shows up behind
selection list elements, if they're below the datepicker. The problem and solution are
described at:
http://dotnetjunkies.com/WebLog/jking/archive/2003/07/21/488.aspx
http://dotnetjunkies.com/WebLog/jking/archive/2003/10/30/2975.aspx
*/
function adjustiFrame(pickerDiv, iFrameDiv)
{
  // we know that Opera doesn't like something about this, so if we
  // think we're using Opera, don't even try
  var is_opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);
  var is_firefox = (navigator.userAgent.toLowerCase().indexOf("firefox") != -1)

  if (navigator.userAgent.toLowerCase().indexOf("msie") == -1)
    return;
  
  // put a try/catch block around the whole thing, just in case
  try {
    if (!document.getElementById(iFrameDivID)) {
      // don't use innerHTML to update the body, because it can cause global variables
      // that are currently pointing to objects on the page to have bad references
      //document.body.innerHTML += "<iframe id='" + iFrameDivID + "' src='javascript:false;' scrolling='no' frameborder='0'>";
      var newNode = document.createElement("iFrame");
      newNode.setAttribute("id", iFrameDivID);
      newNode.setAttribute("src", "javascript:false;");
      newNode.setAttribute("scrolling", "no");
      newNode.setAttribute ("frameborder", "0");
      document.body.appendChild(newNode);
    }
    
    if (!pickerDiv)
      pickerDiv = document.getElementById(datePickerDivID);
    if (!iFrameDiv)
      iFrameDiv = document.getElementById(iFrameDivID);
    
    try {
      iFrameDiv.style.position = "absolute";
      iFrameDiv.style.width = pickerDiv.offsetWidth;
      iFrameDiv.style.height = pickerDiv.offsetHeight ;
      iFrameDiv.style.top = pickerDiv.style.top;
      iFrameDiv.style.left = pickerDiv.style.left;
      iFrameDiv.style.zIndex = pickerDiv.style.zIndex - 1;
      iFrameDiv.style.visibility = pickerDiv.style.visibility ;
      iFrameDiv.style.display = pickerDiv.style.display;
    } catch(e) {
    }
 
  } catch (ee) {
  }
}

function getCompositeDate(theFld)
{
	var theField,theRet,theMonth,theDay,theYear,theBase;
	theBase=theFld.split('_');
	theField=document.getElementById(theBase[0]+'_mm');
	theMonth=theField.value;
	theField=document.getElementById(theBase[0]+'_dd');
	theDay=theField.value;
	theField=document.getElementById(theBase[0]+'_yy');
	theYear=theField.value;
	theRet=new Date(theMonth+'/'+theDay+'/'+theYear);
	return theRet;
}

function setCompositeDate(theFld,theDate)
{
	var theField,theRet,theMonth,theDay,theYear,theBase;
	if (typeof(theDate)=='string'){ theDate=new Date(theDate) };
	theBase=theFld.split('_');
	theField=document.getElementById(theBase[0]+'_dd');
	theField.value=theDate.getDate();
	theField=document.getElementById(theBase[0]+'_yy');
	theField.value=theDate.getFullYear();
	theField=document.getElementById(theBase[0]+'_mm');
	theField.value=theDate.getMonth()+1;
	var pickerDiv = document.getElementById(datePickerDivID);
  pickerDiv.style.visibility = "hidden";
  pickerDiv.style.display = "none";
 
  adjustiFrame();
  theField.focus();
  // after the datepicker has closed, optionally run a user-defined function called
  // datePickerClosed, passing the field that was just updated as a parameter
  // (note that this will only run if the user actually selected a date from the datepicker)
  //if ((dateString) && (typeof(datePickerClosed) == "function"))
  //  datePickerClosed(targetDateField);
}

// Utility function
function getSelectedValue(theField,theDefault)
{
		var theRet;
		if (theField)
		{
			theRet=theField.options[theField.options.selectedIndex].value;
		}
		else
		{
			theRet=theDefault;
		}
		return theRet;
}

function SetMenu(theMenu,theVal)
{
	var bFound=false
	for (i=0;i<theMenu.length;i++)
	{
		if (theMenu.options[i].value==theVal)
		{
			theMenu.options[i].selected=true
			bFound=true
			break;
		}
	}
}

function setOffsetDate(dateFieldName,offsetDay,offsetMonth,offsetYear)
{
	var theField=document.getElementById(dateFieldName);
	var theMonth,theDay,theYear,theDate,theBase;
	
	theBase=dateFieldName.split('_');
	theDate=new Date();
	theMonth = (theDate.getMonth()+offsetMonth) % 12;
  theYear = theDate.getFullYear() + parseInt((theDate.getMonth()+1+offsetMonth) / 12) + offsetYear;
  if (theMonth < 0) {
    theMonth += 12;
    theYear += -1;
  }
  theDate.setMonth(theMonth);
  theDate.setFullYear(theYear);

	if (offsetDay != 0)
	{
		theDate.setDate(theDate.getDate()+offsetDay);
	}
	theMonth=theDate.getMonth()+1;
	theDay=theDate.getDate();
	theYear=theDate.getFullYear();
	setCompositeDate(theBase[0],theDate);
}

function hideDatePicker()
{
	var pickerDiv = document.getElementById(datePickerDivID);
	  pickerDiv.style.visibility = "hidden";
	  pickerDiv.style.display = "none";
	  adjustiFrame();
}

function isDatePicker(theEl)
{
	if (theEl.id==datePickerDivID)
	{ theRet=true; }
	else if (theEl.parentNode)
	{ theRet=isDatePicker(theEl.parentNode); }
	else
	{ theRet=false; }
	return theRet;
}

function checkDatePickerKey(e) 
{
	var theDatePicker=document.getElementById('datepicker');
	var pK;

	if (theDatePicker && theDatePicker.style.visibility != 'hidden')
	{
		pK = document.all? window.event.keyCode:e.which;
		if ((pK==0) || (pK==27)) { hideDatePicker(); }
	}
}

function checkDatePickerClick(e)
{
	var theDatePicker=document.getElementById('datepicker');
	var e1;
	if (theDatePicker && theDatePicker.style.visibility != 'hidden')
	{
		if (!e) e = window.event;
		if (e.target) { e1=e.target; }
		else if (e.srcElement) { e1=e.srcElement; }
		if (! isDatePicker(e1)) {	hideDatePicker();	}
	}
}