var rolling = true;
	function preload() {
		if (document.images) {
			var dir = arguments['0'];
				for (var i=1; i<arguments.length; i++) {
					if (arguments[i] == 'done') rolling = true;
					else {
						eval(arguments[i]+'_on = new Image()')
						eval(arguments[i]+'_on.src = dir+"'+arguments[i]+'_on.gif";')
						eval(arguments[i]+'_off = new Image()')
						eval(arguments[i]+'_off.src = dir+"'+arguments[i]+'_off.gif";')
				}
			}
		}
	}
	preload('img/generic/menu/','the_elements','the_human_body','the_odyssey','changing_voices','home','the_poets','top_tips','curriculum','resources','feedback','credits');
	preload('img/generic/','education_home','barbican_home');

	function roll(i,s) {
		if(rolling) document.images[i].src = eval(i + '_' + s + '.src');
	}
	
	function player(URL) {
		var popup_width = 310
		var popup_height = 230
		day = new Date();
		id = day.getTime();
		eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+popup_width+',height='+popup_height+'');");
}

	function audio(URL) {
		var popup_width = 310
		var popup_height = 200
		day = new Date();
		id = day.getTime();
		eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+popup_width+',height='+popup_height+',left=60,top=10');");
}