function ajxfav(nurl){
  var ajx = false;
  if(window.XMLHttpRequest){
    try{
      ajx = new XMLHttpRequest();
    }catch(e){
      ajx = false;
    }
  }else if(window.ActiveXObject){
    try{
      ajx = new ActiveXObject("Msxml2.XMLHTTP");
    }catch(e){
      try{
        ajx = new ActiveXObject("Microsoft.XMLHTTP");
      }catch(e){
        ajx = false;
      }
    }
  }
  ajx.open('GET', 'http://www.abcjuegos.net/fav.php?j='+nurl, true);
  ajx.onreadystatechange=function(){
    if (ajx.readyState==4){
      document.getElementById("favoritos").innerHTML=ajx.responseText;
    } 
  }
  ajx.send(null);
}