var http = getHTTPObject();
 
function getHTTPObject(){
	var xmlhttp;
	try {    // Firefox, Opera 8.0+, Safari
		xmlhttp = new XMLHttpRequest();    
	} catch (e)	{    // Internet Explorer
		try {
			xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e){
			try {
				xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
	return xmlhttp;
}

function sendHttpRequest(url, func){
	http.open("GET", url, true);
	http.onreadystatechange = function(){
		if(http.readyState == 4){
			func(http.responseText);
		}
	}
	http.send(null);
}