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) {
		b1_home_over = newImage("images/b1-home_over.gif");
		b2_about_over = newImage("images/b2-about_over.gif");
		b3_news_over = newImage("images/b3-news_over.gif");
		b4_downloads_over = newImage("images/b4-downloads_over.gif");
		b5_contact_over = newImage("images/b5-contact_over.gif");
		b6_distributor_over = newImage("images/b6-distributor_over.gif");
		bs1_cameras_over = newImage("images/bs1-cameras-over.gif");
		bs2_sources_over = newImage("images/bs2-sources-over.gif");
		bs3_services_over = newImage("images/bs3-services-over.gif");
		bs4_industries_over = newImage("images/bs4-industries-over.gif");
		preloadFlag = true;
	}
}