// Image Preloading
//
//     -Sets up all of the images that should be preloaded for each page including the main navigation tabs
//     -Defines the funcitons used to swap the preloaded images in and out

	preload_images = new Object();
	preload_images['client_login'] = new Array('images/client_login.png', 'images/client_login_over.png');
	preload_images['contact_form_bg'] = new Array('images/notes/contact.png', 'images/notes/contact_response.png');
	preload_images['next_link'] = new Array('images/next_link.png', 'images/next_link_over.png');
	preload_images['back_link'] = new Array('images/back_link.png', 'images/back_link_over.png');
	preload_images['video_link'] = new Array('images/polaroids/home.png', 'images/polaroids/home_over.png');	
	
	pre_image = new Object();
	pre_img_over = new Object(); 
	for(im in preload_images){
		pre_image[im] = new Image();
		pre_image[im].src = preload_images[im][0];
		
		pre_img_over[im] = new Image();
		pre_img_over[im].src = preload_images[im][1];
	}
			
	menu_images = new Array(
							new Array('images/tabs/about.png', 'images/tabs/about_over.png'),
							new Array('images/tabs/demo.png', 'images/tabs/demo_over.png'),
							new Array('images/tabs/video.png', 'images/tabs/video_over.png'),
							new Array('images/tabs/web.png', 'images/tabs/web_over.png'),
							new Array('images/tabs/media.png', 'images/tabs/media_over.png'),
							new Array('images/tabs/testimonials.png', 'images/tabs/testimonials_over.png')
							);

	menu_img = new Object();
	menu_over = new Object();
	for(i = 0; i < 7; i++){
		menu_img[i] = new Image();
		menu_img[i].src = menu_images[i][0];
		
		menu_over[i] = new Image();
		menu_over[i].src = menu_images[i][1];
	}
	
	function menuRollOver(menu_item){
		menu = document.getElementById('menu_'+menu_item);
		menu.style.backgroundImage = "url(" + menu_over[menu_item].src + ")";
	}
	function menuRollOut(menu_item){
		menu = document.getElementById('menu_'+menu_item);
		menu.style.backgroundImage = "url(" + menu_img[menu_item].src + ")";
	}
	
	function imageRollOver(targ, img_name){
		targ.src = pre_img_over[img_name].src;	
	}
	function imageRollOut(targ, img_name){
		targ.src = pre_image[img_name].src;	
	}