var capa1;
	  var capa2;
  function cambio(){
     	if (document.layers) capa1 = eval("document.capa1");
		if (document.layers) capa2 = eval("document.capa2");
      	if (document.all) capa1 = "capa1.style";
		if (document.all) capa2 = "capa2.style";
  	if (document.getElementById) capa1 = eval('document.getElementById("capa1").style');
	if (document.getElementById) capa2 = eval('document.getElementById("capa2").style');
  }
function cambio2(){
	cambio();
  		capa1.display = (document.layers) ? "none" : "none";
		capa2.display = (document.layers) ? "block" : "block";
  		}
function cambio1(){
	cambio();
  		capa1.display = (document.layers) ? "block" : "block";
		capa2.display = (document.layers) ? "none" : "none";
		}
//  }