if (document) {
	img1on = new Image();      
	img1on.src = "images/nav_home_sbt.gif";
	img2on = new Image();      
	img2on.src = "images/nav_about_sbt.gif";
	img3on = new Image();      
	img3on.src = "images/nav_calendar_sbt.gif";
	img4on = new Image();      
	img4on.src = "images/nav_music_sbt.gif";
	img5on = new Image();      
	img5on.src = "images/nav_photos_sbt.gif";
	img6on = new Image();      
	img6on.src = "images/nav_videos_sbt.gif";
	img7on = new Image();      
	img7on.src = "images/nav_song_sbt.gif";
	img8on = new Image();      
	img8on.src = "images/nav_store_sbt.gif";
	img9on = new Image();      
	img9on.src = "images/nav_booking_sbt.gif";

	img1off = new Image(); 
	img1off.src = "images/nav_home_bt.gif";
	img2off = new Image(); 
	img2off.src = "images/nav_about_bt.gif";
	img3off = new Image(); 
	img3off.src = "images/nav_calendar_bt.gif";
	img4off = new Image(); 
	img4off.src = "images/nav_music_bt.gif";
	img5off = new Image(); 
	img5off.src = "images/nav_photos_bt.gif";
	img6off = new Image(); 
	img6off.src = "images/nav_videos_bt.gif";
	img7off = new Image(); 
	img7off.src = "images/nav_song_bt.gif";
	img8off = new Image(); 
	img8off.src = "images/nav_store_bt.gif";
	img9off = new Image(); 
	img9off.src = "images/nav_booking_bt.gif";
}

// Function to 'activate' images
function imgOn(imgName) {
	if (document) {
		document[imgName].src = eval(imgName + "on.src");
	}
}

// Function to 'deactivate' images
function imgOff(imgName) {
	if (document) {
		document[imgName].src = eval(imgName + "off.src");
	}
}