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) {
		menu_front_page_roll = newImage("../images/menu/front_page_roll.gif");
		menu_film_counsel_roll = newImage("../images/menu/film_counsel_roll.gif");
		menu_digital_virgin_roll = newImage("../images/menu/digital_virgin_roll.gif");
		menu_one_life_stand_roll = newImage("../images/menu/one_life_stand_roll.gif");
		menu_hd24p_roll = newImage("../images/menu/hd24p_roll.gif");
		menu_tape_to_film_roll = newImage("../images/menu/tape_to_film_roll.gif");
		menu_dlp_roll = newImage("../images/menu/dlp_roll.gif");
		menu_tools_roll = newImage("../images/menu/tools_roll.gif");
		menu_sources_roll = newImage("../images/menu/sources_roll.gif");
		menu_links_roll = newImage("../images/menu/links_roll.gif");
		menu_glossary_roll = newImage("../images/menu/glossary_roll.gif");
		menu_download_roll = newImage("../images/menu/download_roll.gif");
		menu_support_roll = newImage("../images/menu/support_roll.gif");
		menu_feedback_roll = newImage("../images/menu/feedback_roll.gif");
		preloadFlag = true;
	}
}