sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			className = this.className;
			this.className+=" sfhover";
			//alert (this.className);
			switchImage('topnav_' + className,'on');
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
			switchImage('topnav_' + this.className,'off');
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);


var imgDir = "../images/topnav/";
function simplePreload()
{
    var args = simplePreload.arguments;
    document.imageArray = new Array(args.length);
    for(var i=0; i<args.length; i++)
    {
        document.imageArray[i] = new Image;
        document.imageArray[i].src = imgDir + args[i];
    }
}

function switchImage(imgName, onOff) {
    if (document.images) {
        if (onOff == "on") document.images[imgName].src = imgDir + imgName + "_on.gif";
        else document.images[imgName].src = imgDir + imgName + "_off-2007.gif";
    }
}