var activeId = '';

function preload_images() {
	
	if (document.images) {
		buttonHover = new Object();
		buttonHover["nav_home"] = new Image(40,18);
		buttonHover["nav_home"].src = "/images/header/nav_home_hover.gif";
		buttonHover["nav_blog"] = new Image(30,18);
		buttonHover["nav_blog"].src = "/images/header/nav_blog_hover.gif";
		buttonHover["nav_portland"] = new Image(58,18);
		buttonHover["nav_portland"].src = "/images/header/nav_portland_hover.gif";
		buttonHover["nav_view_cart"] = new Image(65,18);
		buttonHover["nav_view_cart"].src = "/images/header/nav_view_cart_hover.gif";
		buttonHover["nav_checkout"] = new Image(64,18);
		buttonHover["nav_checkout"].src = "/images/header/nav_checkout_hover.gif";
		buttonHover["nav_movies"] = new Image(48,18);
		buttonHover["nav_movies"].src = "/images/header/nav_movies_hover.gif";
		buttonHover["nav_about"] = new Image(42,18);
		buttonHover["nav_about"].src = "/images/header/nav_about_hover.gif";
		buttonHover["nav_help"] = new Image(31,18);
		buttonHover["nav_help"].src = "/images/header/nav_help_hover.gif";
		buttonHover["nav_contact"] = new Image(54,18);
		buttonHover["nav_contact"].src = "/images/header/nav_contact_hover.gif";
		buttonHover["nav_shop_online"] = new Image(83,18);
		buttonHover["nav_shop_online"].src = "/images/header/nav_shop_online_hover.gif";
		
		buttonNormal = new Object();
		buttonNormal["nav_home"] = new Image(40,18);
		buttonNormal["nav_home"].src = "/images/header/nav_home_norm.gif";
		buttonNormal["nav_blog"] = new Image(30,18);
		buttonNormal["nav_blog"].src = "/images/header/nav_blog_norm.gif";
		buttonNormal["nav_portland"] = new Image(58,18);
		buttonNormal["nav_portland"].src = "/images/header/nav_portland_norm.gif";
		buttonNormal["nav_view_cart"] = new Image(65,18);
		buttonNormal["nav_view_cart"].src = "/images/header/nav_view_cart_norm.gif";
		buttonNormal["nav_checkout"] = new Image(64,18);
		buttonNormal["nav_checkout"].src = "/images/header/nav_checkout_norm.gif";
		buttonNormal["nav_movies"] = new Image(48,18);
		buttonNormal["nav_movies"].src = "/images/header/nav_movies_norm.gif";
		buttonNormal["nav_about"] = new Image(42,18);
		buttonNormal["nav_about"].src = "/images/header/nav_about_norm.gif";
		buttonNormal["nav_help"] = new Image(31,18);
		buttonNormal["nav_help"].src = "/images/header/nav_help_norm.gif";
		buttonNormal["nav_contact"] = new Image(54,18);
		buttonNormal["nav_contact"].src = "/images/header/nav_contact_norm.gif";
		buttonNormal["nav_shop_online"] = new Image(83,18);
		buttonNormal["nav_shop_online"].src = "/images/header/nav_shop_online_norm.gif";

	}
}


function rollover(imageId, type) {

	var image = document.getElementById(imageId);
	
	if (type == "hover") {
		if (imageId != activeId) {
			image.src = buttonHover[imageId].src;
		}
		return true;
	}
	else if (type == "normal") {
		if (imageId != activeId) {
			image.src = buttonNormal[imageId].src;
		}
		return true;
	}
	else if (type == "active") {
		if (activeId && (imageId != activeId)) {
			var active_img = document.getElementById(activeId);
			active_img.src = buttonNormal[activeId].src;
		}
		image.src = buttonHover[imageId].src;
		activeId = imageId;
		return true; 
	}
	else
		return true;
}

window.onload = preload_images;