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) {
		bt_htp_btn_howtoplay_map_over = newImage("graphics/bt_htp_btn_over.gif");
		bt_bb_r2_archbtn_over = newImage("graphics/bt_bb_r2_archbtn-over.gif");
		bt_bb_g34_this_over = newImage("graphics/bt_bb_g34_this-over.gif");
		bt_bb_g34_that_over = newImage("graphics/bt_bb_g34_that-over.gif");
		bt_bb_g56_this_over = newImage("graphics/bt_bb_g56_this-over.gif");
		bt_bb_g78_this_over = newImage("graphics/bt_bb_g78_this-over.gif");
		bt_bb_g56_that_over = newImage("graphics/bt_bb_g56_that-over.gif");
		bt_bb_g78_that_over = newImage("graphics/bt_bb_g78_that-over.gif");
		preloadFlag = true;
	}
}