on_home = new Image(150,37);
on_home.src = "../images/home_bt_on_3.jpg";
off_home = new Image(150,37);
off_home.src = "../images/home_bt_off_3.jpg";

on_book = new Image(150,37);
on_book.src = "../images/book_bt_on_3.jpg";
off_book = new Image(150,37);
off_book.src = "../images/book_bt_off_3.jpg";

on_news = new Image(150,37);
on_news.src = "../images/news_bt_on_3.jpg";
off_news = new Image(150,37);
off_news.src = "../images/news_bt_off_3.jpg";

on_about = new Image(150,37);
on_about.src = "../images/about_bt_on_3.jpg";
off_about = new Image(150,37);
off_about.src = "../images/about_bt_off_3.jpg";

function doPreload()
{

	var the_images = new Array(on_home.src,off_home.src,select_home.src,on_book.src,off_book.src,
select_book.src,on_news.src,off_news.src,select_news.src,on_about.src,off_about.src,select_about.src);
	preloadImages(the_images);
}

function preloadImages(the_images_array) {

	for(loop = 0; loop < the_images_array.length; loop++)
	{
   		var an_image = new Image();
		an_image.src = the_images_array[loop];
	}
}