var httpObj;
function createXMLHttpRequest(){
	try{
		httpObj = new XMLHttpRequest();
	}catch(e){
		try{
			httpObj = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(e){
			try{
				httpObj = new ActiveXObject("Microsoft.XMLHTTP");
			}catch(e){
				httpObj = null;
			}
		}
	}
}