function preload(url) {
	result = new Image();
	result.src = url;
	return result;
}

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

function configureNavItem(itemName) {
	link = document.getElementById("navlink" + itemName);
	image = document.getElementById("navimg" + itemName);
	if (link == null || image == null) {
		return;
	}
	preload("/imager-web/images/a_" + itemName + ".gif");
	link.onmouseover = function() {
		image = document.getElementById("navimg" + itemName);
		image.src = "/labs/imager/imager-web/images/a_" + itemName + ".gif";
	}
	link.onmouseout = function() {
		image = document.getElementById("navimg" + itemName);
		image.src = "/labs/imager/imager-web/images/b_" + itemName + ".gif";
	}
}

var navbar_oldonload = window.onload;
window.onload = function() {
	configureNavItem("imager");
	configureNavItem("compsci");
	configureNavItem("ubc");
	if (navbar_oldonload != null) {
		navbar_oldonload();
	}
}