function toggleCat(whichCat)
{
    var isVis = document.getElementById("subcat" + whichCat.toString()).style.display == "";
    document.getElementById("subcat" + whichCat.toString()).style.display = (isVis) ? "none" : "";
    document.getElementById("subcatlink" + whichCat.toString()).src = (isVis) ? "/images/plus.jpg" : "/images/minus.jpg";
    
}
window.onresize = resized;
window.onload = resized;
function resized()
{
    vport = viewport();
    document.getElementById("shoppingcartdiv").style.maxHeight = (vport.height - 430).toString() + "px";
}
function viewport()
{
var e = window
, a = 'inner';
if ( !( 'innerWidth' in window ) )
{
a = 'client';
e = document.documentElement || document.body;
}
return { width : e[ a+'Width' ] , height : e[ a+'Height' ] }
}