if (document.images) {

designa = new Image();
designa.src = "images/nav-design.gif";
designb = new Image();
designb.src = "images/nav-design-hover.gif";
traininga = new Image();
traininga.src = "images/nav-training.gif";
trainingb = new Image();
trainingb.src = "images/nav-training-hover.gif";
seoa = new Image();
seoa.src = "images/nav-seo.gif";
seob = new Image();
seob.src = "images/nav-seo-hover.gif";
portfolioa = new Image();
portfolioa.src = "images/nav-portfolio.gif";
portfoliob = new Image();
portfoliob.src = "images/nav-portfolio-hover.gif";
pricinga = new Image();
pricinga.src = "images/nav-pricing.gif";
pricingb = new Image();
pricingb.src = "images/nav-pricing-hover.gif";

}
if (document.images) {
	function flip(graphic) {
	        imageon = eval("document." + graphic);
        	imageon.src = "images/nav-" + graphic + "-hover.gif";
	}
}
if (document.images) {
	function restore(graphic) {
        	imageoff = eval("document." + graphic);
        	imageoff.src = "images/nav-" + graphic + ".gif";
	}
}