if (document.images) {

	nav01a = new Image();
    nav01a.src = "images/nav_products-over.gif";
    nav01b = new Image();
    nav01b.src = "images/nav_products.gif";

    	nav02a = new Image();
    nav02a.src = "images/nav_customerservice-over.gif";
    nav02b = new Image();
    nav02b.src = "images/nav_customerservice.gif";

	nav03a = new Image();
    nav03a.src = "images/nav_sales-over.gif";
    nav03b = new Image();
    nav03b.src = "images/nav_sales.gif";

	nav04a = new Image();
    nav04a.src = "images/nav_ourgroup-over.gif";
    nav04b = new Image();
    nav04b.src = "images/nav_ourgroup.gif";

	nav05a = new Image();
    nav05a.src = "images/nav_employment-over.gif";
    nav05b = new Image();
    nav05b.src = "images/nav_employment.gif";

	nav06a = new Image();
    nav06a.src = "images/nav_tradeshows-over.gif";
    nav06b = new Image();
    nav06b.src = "images/nav_tradeshows.gif";

	nav07a = new Image();
    nav07a.src = "images/nav_contactus-over.gif";
    nav07b = new Image();
    nav07b.src = "images/nav_contactus.gif";

	nav08a = new Image();
    nav08a.src = "images/nav_home-over.gif";
    nav08b = new Image();
    nav08b.src = "images/nav_home.gif";

        }

    function img_act(imgName) {
    if (document.images) {
        aimgOn = eval(imgName + "a" + ".src");
                document [imgName].src = aimgOn;
                }

        }
   function img_inact(imgName) {
    if (document.images) {
        bimgOn = eval(imgName + "b"  + ".src");
        document [imgName].src = bimgOn;
        }
        }