if (document.images) {
image0a = new Image();
image0a.src = "images/concept_off.gif";
image0b = new Image();
image0b.src = "images/concept_on.gif";
image1a = new Image();
image1a.src = "images/product_off.gif";
image1b = new Image();
image1b.src = "images/product_on.gif";
image2a = new Image();
image2a.src = "images/communities_off.gif";
image2b = new Image();
image2b.src = "images/communities_on.gif";
image3a = new Image();
image3a.src = "images/started_off.gif";
image3b = new Image();
image3b.src = "images/started_on.gif";
image4a = new Image();
image4a.src = "images/otherinfo_off.gif";
image4b = new Image();
image4b.src = "images/otherinfo_on.gif";
} 

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
    if (document.images) {
        for (var i=0; i<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
        }
    }
} 

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		concept_on = newImage("images/concept_on.gif");
		product_on = newImage("images/product_on.gif");
		communities_on = newImage("images/communities_on.gif");
		started_on = newImage("images/started_on.gif");
		company_on = newImage("images/otherinfo_on.gif");
		preloadFlag = true;
	}
}

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