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) {
		btn_home_over = newImage("images/navbar/btn-home-over.gif");
		btn_community_over = newImage("images/navbar/btn-community-over.gif");
		// btn_browsemembers_over = newImage("images/navbar/btn-browsemembers-over.gif");
		btn_latestnews_over = newImage("images/navbar/btn-latestnews-over.gif");
		btn_chat_over = newImage("images/navbar/btn-chat-over.gif");
		btn_want_music_over = newImage("images/navbar/btn-want-music-over.gif");
		btn_got_music_over = newImage("images/navbar/btn-got-music-over.gif");
		btn_register_over = newImage("images/navbar/btn-register-over.gif");
		btn_signup_over = newImage("images/navbar/btn-signup-over.gif");
		btn_search_over = newImage("images/navbar/btn-search-over.gif");
		btn_aboutsongtank_over = newImage("images/navbar/btn-aboutsongtank-over.gif");
		btn_log_in_over = newImage("images/navbar/btn-log-in-over.gif");
		preloadFlag = true;
	}
}