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) {
                but_home_over = newImage("images/but_home-over.gif");
                but_about_over = newImage("images/but_about-over.gif");
                but_providers_over = newImage("images/but_providers-over.gif");
                but_news_over = newImage("images/but_news-over.gif");
                but_community_over = newImage("images/but_community-over.gif");
                but_links_over = newImage("images/but_links-over.gif");
                but_faq_over = newImage("images/but_faq-over.gif");
                but_saying_over = newImage("images/but_saying-over.gif");
                preloadFlag = true;
        }
}