var xmlHttp
//window.onbeforeunload = showItems(2);
//window.onload  = showItems(1);
function showItems(str)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
} 
var url="http://www.construction-estimating.com/ajax-tracker.php"
//var url="ajaxtest2.asp"
url=url+"?"+str //pageId="+page_id+"&timestamp=0.1234&action="+str
//alert('url='+url+'name='+window.location)

xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

function GetXmlHttpObject()
{ 
var objXMLHttp=null
if (window.XMLHttpRequest)
{
objXMLHttp=new XMLHttpRequest()
}
else if (window.ActiveXObject)
{
objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
}
return objXMLHttp
}