if (document.images) {
                image1on = new Image();
                image1on.src = "_images/menu_home_on.gif";
                image2on = new Image();
                image2on.src = "_images/menu_aboutus_on.gif";
                image3on = new Image();
                image3on.src = "_images/menu_services_on.gif";
                image4on = new Image();
                image4on.src = "_images/menu_resources_on.gif";
                image5on = new Image();
                image5on.src = "_images/menu_careers_on.gif";

                image1off = new Image();
                image1off.src = "_images/menu_home_off.gif";
                image2off = new Image();
                image2off.src = "_images/menu_aboutus_off.gif";
                image3off = new Image();
                image3off.src = "_images/menu_services_off.gif";
                image4off = new Image();
                image4off.src = "_images/menu_resources_off.gif";
                image5off = new Image();
                image5off.src = "_images/menu_careers_off.gif";
        }

        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");
                }
                }
        }