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) {
		nav_bullet	 		= newImage("images/nav_bullet.gif");
		nav_bullet_over		= newImage("images/nav_bullet-over.gif");
		index_02_over 		= newImage("images/index_02-over.gif");
		index_03_over 		= newImage("images/index_03-over.gif");
		index_04_over 		= newImage("images/index_04-over.gif");
		index_05_over 		= newImage("images/index_05-over.gif");
		index_06_over 		= newImage("images/index_06-over.gif");
		index_07_over 		= newImage("images/index_07-over.gif");
		index_08_over 		= newImage("images/index_08-over.gif");
		contact_over 		= newImage("images/strap_line_contact.gif");
		events_over 		= newImage("images/strap_line_events_diary.gif");
		hca_news_over 		= newImage("images/strap_line_hca_news.gif");
		home_over 			= newImage("images/strap_line_home.gif");
		links_over 			= newImage("images/strap_line_links.gif");
		membership_over 	= newImage("images/strap_line_membership.gif");
		sub_committees_over = newImage("images/strap_line_sub_committees.gif");
		preloadFlag = true;
	}
}