var XMLHttp;

function getXMLHttp(){
	var XMLHttp = null;
	try{
		XMLHttp = new XMLHttpRequest();
	}catch(e){
		try{
			XMLHttp = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(e){
			try{
				XMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
			}catch(e){
				alert("Tu navegador no soporta ajax o tienes javascript desahibilitado");
				return false;
			}
		}
	}

	return XMLHttp;
		
}

function getProducts(){
	if (XMLHttp.readyState==4)
	{ 
	document.getElementById("center_content").innerHTML=XMLHttp.responseText;
	}	
}

function sendRequest(id){
	XMLHttp = getXMLHttp();
	
    XMLHttp.onreadystatechange=getProducts;
	XMLHttp.open("GET","productos.php?categoria="+id,true);
	XMLHttp.send(null);
	
}

function showWindow(titulo, vienede)
{
  var win = new Window({id: "producto", className: "alphacube", title: titulo, width:380, height:150, wiredDrag: true}); 
  win.setDestroyOnClose(); 
  win.setURL("http://www.ceneval.net/register.php?vienede="+vienede);
//  win.setLocation(coordenadaX, coordenadaY);
  win.showCenter(true);
  win.toFront();
}