function preloadImages() {
	img00 = new Image();
	img00.src = 'images/menu_on/advertising_info.gif';
	img01 = new Image();
	img01.src = 'images/menu_on/buyers_guide.gif';
	img02 = new Image();
	img02.src = 'images/menu_on/contact_us.gif';
	img03 = new Image();
	img03.src = 'images/menu_on/home.gif';
	img04 = new Image();
	img04.src = 'images/menu_on/industry_news.gif';
	img05 = new Image();
	img05.src = 'images/menu_on/product_news.gif';
	img06 = new Image();
	img06.src = 'images/menu_on/subscribe_to_aso.gif';
	img07 = new Image();
	img07.src = 'images/menu_on/this_month_in_aso.gif';
}

function swapImage(imgName,newState) {
	if (newState == 'on') {
		document[imgName].src = "images/menu_on/" + imgName + ".gif";
		}
	if (newState == 'off') {
		document[imgName].src = "images/menu_off/" + imgName + ".gif";
	}
}