function start(pagina) { 
OpenWin = window.open(pagina,'','width=635,height=489'); 
}

var childlayer = "";
function showlayer(layer){
 var div = document.getElementById(layer);
 if (div) div.style.visibility = "visible";
}

function setnewchild(layer){
 if (childlayer!="" && childlayer!=layer){ hidelayer(childlayer); }
 childlayer = "";
 showlayer(layer);
}

function hidelayer(){
 if (childlayer!=""){
  var div = document.getElementById(childlayer);
  if (div)div.style.visibility = "hidden";
 }
}

var loaded = false;
function moveFooter(){
if (loaded==true){
  if (document.all){
      newtop = document.body.clientHeight + document.body.scrollTop; 
      footerlayer = document.all.footerdiv;
     }else{
      newtop = window.pageYOffset + window.innerHeight; 	 	
      footerlayer = document.getElementById('footerdiv'); 
      }
   footerlayer.style.top = newtop-24;
   }
}