function post(url, paras, callbackFunction){
 
		var body = "";
		for (var val in paras) {
		    body = body + val+"="+paras[val]+"&";
		}
	
        var request = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP.3.0");
 
        request.open("POST", url, true);
        request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
 
        request.onreadystatechange = function(){
 
                if (request.readyState == 4 && request.status == 200) {
 
                        if (request.responseText){
;
                                callbackFunction(request.responseText);
                        }
                }
        };
        request.send(body);
}

function getElement(name)
{
	return document.getElementById(name);
}