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(ctx) {
    if (document.images) {
	aboutdenverwineguy_over = newImage(ctx+"images/left-nav/aboutdenverwineguy-over.gif");
	glossary_over           = newImage(ctx+"images/left-nav/glossary-over.gif");
	vintagechart_over       = newImage(ctx+"images/left-nav/vintagechart-over.gif");
	services_over           = newImage(ctx+"images/left-nav/services-over.gif");
	howweratewine_over      = newImage(ctx+"images/left-nav/howweratewine-over.gif");
	wineoftheweek_over      = newImage(ctx+"images/left-nav/wineoftheweek-over.gif");
	funstuff_over           = newImage(ctx+"images/left-nav/funstuff-over.gif");
	subscribe_over          = newImage(ctx+"images/left-nav/subscribe-over.gif");
	freetrial_over          = newImage(ctx+"images/left-nav/freetrial-over.gif");
	winetreasures_over      = newImage(ctx+"images/left-nav/winetreasures-over.gif");
	preloadFlag = true;
    }
}