function aleatorio(inferior,superior){
    numPosibilidades = superior - inferior
    aleat = Math.random() * numPosibilidades
    aleat = Math.round(aleat)
    return parseInt(inferior) + aleat
}


function cargar_ajax(urlx,divx,preload){
var isIE = false;
var req;
	
	var num_random = aleatorio(100000,999999);	
	var url = urlx + num_random;
		
	if (window.XMLHttpRequest){
	req = new XMLHttpRequest();
	req.abort();
	req.onreadystatechange = function(){
		
			if(req.readyState == 4){
			document.getElementById(divx).innerHTML = req.responseText;
			}
				
			else {
			document.getElementById(divx).innerHTML = preload;
			}
		};
		
	req.open("GET",url,true);
	req.send(null);
	}
		
	else if (window.ActiveXObject) {
	isIE = true;
	req = new ActiveXObject("Microsoft.XMLHTTP");
		
		if (req){
		req.abort();	
		req.onreadystatechange = function(){
				
				if(req.readyState == 4){
				document.getElementById(divx).innerHTML = req.responseText;
				}
					
				else {
				document.getElementById(divx).innerHTML = preload;
				}
			};
		
		req.open("GET",url,true);
		req.send();
		}
	}
}