function getQueryVar(theVar,theDefault) 
{
	var query = window.location.search.substring(1);
	var vars = query.split("&");
	var theRet;
	for (var i=0;i<vars.length;i++) 
	{
		var pair = vars[i].split("=");
		if (pair[0] == theVar) 
		{
			theRet=pair[1];
			break;
		}
	}
	if (! theRet){ theRet=theDefault; }
	return theRet;
}
function doAdOnload()
{
	var theTargetID=getQueryVar('target_id',0);
	var theAdID=getQueryVar('ad_id',0);
	var theURL='';
	var theTarget;
	for (var i=1;i<20;i++)
	{
		theTarget=document.getElementById('adTarget'+i);
		if (theTarget)
		{
			if (theTargetID==i && theAdID > 0)
			{
				theURL='/get_ad.php?ad_id='+theAdID+'&target_id='+i;
			}
			else
			{
				theURL='/get_ad.php?target_id='+i;
			}
			SetInnerHTMLFromAjaxResponse(theURL,'adTarget'+i);
		}
	}
}