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

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

var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        howto_hi = newImage("images/btn-howto-hi.gif");
        build_hi = newImage("images/btn-build-hi.gif");
        tips_hi = newImage("images/btn-tipsinfo-hi.gif");
        abouthsf_hi = newImage("images/btn-abouthsf-hi.gif");
        casestudies_hi = newImage("images/btn-casestudies-hi.gif");
        contact_hi = newImage("images/btn-contact-hi.gif");
        links_hi = newImage("images/btn-links-hi.gif");
        quicksearch_hi = newImage("images/btn-index-quicksearch-hi.jpg");
        preloadFlag = true;
    }
}

function topWindow(value) {
	window.open(value,'','width=600,height=350,scrollbars=yes,resizable=yes');
}