//=================== MOUSEOVER IMAGE =====================
function changeImg(imgName, imgURL) {
	document.images[imgName].src = imgURL;
}
//=================== MENU CONTROLER =====================
function pageinit () {
	//preload navigation images
	preloadImages();
	//
	//change current page's navigation button image
	changeButton();
}

function preloadImages() {
	var img_url = [
	"/english/images/home_nav1.gif",
	"/english/images/home_nav1_a.gif",
	"/english/images/home_nav2.gif",
	"/english/images/home_nav2_a.gif",
	"/english/images/home_nav3.gif",
	"/english/images/home_nav3_a.gif",
	"/english/images/home_nav4.gif",
	"/english/images/home_nav4_a.gif",
	"/english/images/home_nav5.gif",
	"/english/images/home_nav5_a.gif",
	"/english/images/home_nav6.gif",
	"/english/images/home_nav6_a.gif",
	"/english/images/nav1.gif",
	"/english/images/nav1_a.gif",
	"/english/images/nav2.gif",
	"/english/images/nav2_a.gif",
	"/english/images/nav3.gif",
	"/english/images/nav3_a.gif",
	"/english/images/nav4.gif",
	"/english/images/nav4_a.gif"
	];
	
	var pre_img = new Image ();
	for (i in img_url) {
		pre_img.src = img_url[i];
	};
}

function changeButton() {
	var alternative_string = "_a";
	var cat_array = ["active1", "active2", "active3", "active4"];
	//
	for (i in cat_array) {
		var tmp_idname = document.getElementById(cat_array[i]);
		if (tmp_idname == null) {
			//Do Nothing
		} else {
			var imgid = "nav_" + cat_array[i];
			var image_path = document.getElementById(imgid).src.split("/");
			//
			//Old IE and stupid Opera need this
			var image_file = image_path[image_path.length - 1].split(".")[0].split("_");
			if (image_file[image_file.length-1] == "a") {
				var alternative = image_path[image_path.length - 1];
			} else {
				var alternative = image_path[image_path.length - 1].split(".").join(alternative_string + ".");
			}
			//
			image_path[image_path.length - 1] = alternative;
			image_path = image_path.join("/");
			document.getElementById(imgid).src = image_path;
			document.getElementById(imgid).onmouseover = function () {
				document.getElementById(imgid).src = image_path;
			};
			document.getElementById(imgid).onmouseout = function () {
				document.getElementById(imgid).src = image_path;
			};
		}
	}
}