if(document.layers) {
   doc = "document['";
   docfin = "']";
   sty = "";
   limitea = 60;
   limiteb = 120;
  }
  else if(document.all){
   doc = "document.all['";
   docfin = "']";
   sty = ".style";
   limitea = 60;
   limiteb = 120;
  }
  else if(document.getElementById) {
   doc = "document.getElementById('";
   docfin = "')";
   sty = ".style";
   limitea = 60;
   limiteb = 120;
  }

function preparativos(){
promo1 = new Image();
promo1.src = "promo1.gif";
promo2 = new Image();
promo2.src = "promo2.gif";
}

function ir(){

}

var contador = 0;
function llamar(){
 promouno = eval(doc + "promoa" + docfin + sty);
 promodos = eval(doc + "promob" + docfin + sty)
 timer1 = setTimeout("llamar()", 1);
 contador = contador + 1;
      if (contador == limitea) {promouno.visibility = "hidden"; promodos.visibility = "visible";}
      if (contador == limiteb) {window.location="http://www.enlacenet.com.mx/enlacenet.html";}
}