button_1_down = new Image(); button_1_down.src = "images/home_over.jpg";
button_2_down = new Image(); button_2_down.src = "images/learn_over.jpg";
button_3_down = new Image(); button_3_down.src = "images/shop_over.jpg";
button_4_down = new Image(); button_4_down.src = "images/chat_over.jpg";
button_5_down = new Image(); button_5_down.src = "images/gallery_over.jpg";
button_6_down = new Image(); button_6_down.src = "images/club_over.jpg";
button_7_down = new Image(); button_7_down.src = "images/links_over.jpg";

function check_button() {
	switch (doc) {
		case 1 :
			document.sassy_surf_home.src=button_1_down.src;
		break;
		case 2 :
			document.sassy_surf_learning.src=button_2_down.src;
		break;
		case 3 :
			document.sassy_surf_shopping.src=button_3_down.src;
		break;
		case 4 :
			document.sassy_surf_chatting.src=button_4_down.src;
		break;
		case 5,8 :
			document.sassy_surf_gallery.src=button_5_down.src;
		break;
		case 6 :
			document.sassy_surf_club.src=button_6_down.src;
		break;
		case 7 :
			document.sassy_surf_links.src=button_7_down.src;
		break;
		default :
			;
	}
}