function RequestValue(url,Items) {
	var req = createRequest();
	
	// code to prevent caching
	var d = new Date();
	
	// set up request parameters - uses GET method
	//alert(url+'?code='+d.getTime()+Items);
	req.open('GET',url+'?code='+d.getTime()+Items,false);
	
	req.send(null);
	// process returned data - error condition
	
	if (req.status != 200) {
		alert('Probleme with Request');
		return "";
	} else {
		return req.responseText;
	}
}

function cargando()
{
	//alert("ssss");
	document.getElementById("contenido_telas").innerHTML = "<div style='width:100%;text-align:center;'><img src='medias/img/ajax-loader.gif' /></div>";
}

function RequestValueCargandado(url,Items) {
	var req = createRequest();
	var d = new Date();
	//req.onreadystatechange = cargando();
	req.onreadystatechange = function()
	{
		alert(req.readyState);
	}
	
	
	//req.onreadystatechange = function(){ cargando(); };
	req.open('GET',url+'?code='+d.getTime()+Items,false);
	
	req.send(null);
	
	if (req.status != 200) {
		alert('Probleme with Request');
		return "";
	} 
	else
	{
		return req.responseText;
	}
}


function createRequest() {
	var request;
	try {
		request = new XMLHttpRequest();
	}
	catch (tryIE) {
		try {
			request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (tryOlderIE) {
			try {
				request = new ActiveXObject("Microsoft.XMLHTTP");
		  	}
		  	catch (failed) {
				alert("Error creating XMLHttpRequest");
		  	}
		}
	}
	return request;
}