function getXMLHttpObject() {
	var ret = false;
    if (window.XMLHttpRequest) {
        ret = new XMLHttpRequest ();
		if(ret.readyState == null){
				ret.readyState = 1;
				ret.addEventListener('load', function(){
					ret.readyState = 4;
					if(typeof(ret.onreadystatechange)=='function')
						ret.onreadystatechange();
				}, false);
		}		
    } else if (window.ActiveXObject) {     
        try { ret = new ActiveXObject ("Msxml2.XMLHTTP"); }
        catch (e)
        { try { ret = new ActiveXObject ("Microsoft.XMLHTTP"); }
          catch (e) { }
        }
    } 
    return ret;
}
	
function jxcll(url, call_func)
{

	xmlHttp = getXMLHttpObject();
	if (xmlHttp) {		
		xmlHttp.onreadystatechange = function ()
		{		
			if (xmlHttp.readyState == 4 || xmlHttp.readyState=="complete") {
				call_func(xmlHttp.responseText);
			}
		}
		// Evitar cache en IE
		// url += (url.indexOf("?") == -1) ? '?' + Math.random() : ',' + Math.random();
		xmlHttp.open ('GET', url, true);
		xmlHttp.setRequestHeader( "If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT" );
		xmlHttp.send (null);
	}
}