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(imageset) {
	if (document.images) {
	switch(imageset) {
		case("nav"):
		home_over = newImage("img/home-over.gif");
		about_us_over = newImage("img/about_us-over.gif");
		news_over = newImage("img/news-over.gif");
		competitions_over = newImage("img/competitions-over.gif");
		members_pages_over = newImage("img/members_pages-over.gif");
		resources_over = newImage("img/resources-over.gif");
		newsletters_over = newImage("img/newsletters-over.gif");
		break;
		
		}
		preloadFlag = true;
	}
}