function popUpBanner(urlTarget, windowTarget, widowTitle,
windowProperties){
var remote = null;
remote = window.open('', widowTitle, windowProperties);
if (remote != null) {
        if (remote.opener == null) remote.opener = windowTarget;
        remote.location.href = urlTarget;
}
}

var ns4 = (document.layers); 
var ie4 = (document.all && !document.getElementById); 
var ie5 = (document.all && document.getElementById); 
var ns6 = (!document.all && document.getElementById); 

function attach(id) { 
var obj 
if(ns4) obj = document.layers[id]; 
else if(ie4) obj = document.all[id]; 
else if(ie5 || ns6) obj = document.getElementById(id); 
return obj 
} 
// popUpBanner, expand, and collapse
function expandBanner(parentId, childId){
parentlayer = attach(parentId); 
childlayer = attach(childId); 
parentlayer.style.visibility = "hidden"; 
childlayer.style.visibility = "visible";
}

function collapseBanner(parentId, childId){
parentlayer = attach(parentId); 
childlayer = attach(childId); 
parentlayer.style.visibility = "visible"; 
childlayer.style.visibility = "hidden"; 
}