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

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

var preloadFlag = false;
function preloadImages() {
        if (document.images) {
                MY_over = newImage("/resource/graphics/MY-over.gif");
                GROUP_over = newImage("/resource/graphics/GROUP-over.gif");
                GWS_over = newImage("/resource/graphics/GWS-over.gif");
                DCAL_over = newImage("/resource/graphics/DCAL-over.gif");
                DLIB_over = newImage("/resource/graphics/DLIB-over.gif");
                DISCUS_over = newImage("/resource/graphics/DISCUS-over.gif");
                MEMBER_over = newImage("/resource/graphics/MEMBER-over.gif");
                JOBS_over = newImage("/resource/graphics/CAREER-over.gif");
                COURS_over = newImage("/resource/graphics/COURS-over.gif");
                HELP_over = newImage("/resource/graphics/HELP-over.gif");
                SEARCH_over = newImage("/resource/graphics/SEARCH-over.gif");
                LOGOUT_over = newImage("/resource/graphics/LOGOUT-over.gif");
                preloadFlag = true;
        }
}