var xmlhttp=false;
function getXMLHttpRequest(){
	try {
		xmlhttp = new XMLHttpRequest();//Browser Mozilla, Opera, Safari
	}catch(e)
		{
		try{
		 xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); // IE 7 and later version
		}catch(e){
			try{
			  xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");// IE6 and earlier
			}catch(e){
			   xmlhttp = false;
			}
		}
	}
	return xmlhttp;
}