function createRequest(){
	if (window.ActiveXObject){
		try {
			return new ActiveXObject("Msxml2.XMLHTTP");
		}catch (e1){
			try {
				return new ActiveXObject("Microsoft.XMLHTTP");
			}catch (e2){
				return null;
			}
			
		}
	}else if (window.XMLHttpRequest){
		return new XMLHttpRequest();
	}else{
		return null;
	}
}