function ajax(target,url,postCmd)
{
	if (url.length==0)
	{ 
		document.getElementById(target).innerHTML="";
		return;
	}
	var xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	} 

	xmlHttp.onreadystatechange=function() { 
		if (xmlHttp.readyState==4) { 
			document.getElementById(target).innerHTML=xmlHttp.responseText;
			if (postCmd) {
				eval(postCmd);
			}
		}
	}
	xmlHttp.open("POST",url,true);
	xmlHttp.send(null);
} 

function GetXmlHttpObject()
{
	var xmlHttpObj=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttpObj=new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
			xmlHttpObj=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xmlHttpObj=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttpObj;
}