if (document.images) {
	normal_music = new Image(89,27);
	normal_music.src ="images/btn-music.gif";
	over_music = new Image(89,27);
	over_music.src = "images/btn-music-over.gif";
	
	normal_about = new Image(99,27);
	normal_about.src ="images/btn-about.gif";
	over_about = new Image(99,27);
	over_about.src = "images/btn-about-over.gif";
	
	normal_shows = new Image(87,27);
	normal_shows.src ="images/btn-shows.gif";
	over_shows = new Image(87,27);
	over_shows.src = "images/btn-shows-over.gif";
	
	normal_booking = new Image(88,27);
	normal_booking.src ="images/btn-booking.gif";
	over_booking = new Image(88,27);
	over_booking.src = "images/btn-booking-over.gif";
	
	function chGraphic(imgModule,imgObject) {
		document.images[imgModule].src = eval(imgObject + ".src");
	}
}