function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		header_logo_button_home_over = newImage("images/header_logo-button_home_ove.jpg");
		header_logo_button_tutorials_over = newImage("images/header_logo-button_tutorial.jpg");
		button_home_over = newImage("images/button_home-over.jpg");
		button_home_button_forums_over = newImage("images/button_home-button_forums_o.jpg");
		button_tutorials_over = newImage("images/button_tutorials-over.jpg");
		button_tutorials_button_contact_over = newImage("images/button_tutorials-button_con.jpg");
		button_forums_over = newImage("images/button_forums-over.jpg");
		button_forums_button_contact_over = newImage("images/button_forums-button_contac.jpg");
		button_forums_button_links_over = newImage("images/button_forums-button_links_.jpg");
		button_contact_over = newImage("images/button_contact-over.jpg");
		button_links_over = newImage("images/button_links-over.jpg");
		header_left_button_home_over = newImage("images/header_left-button_home_ove.jpg");
		header_left_button_tutorials_over = newImage("images/header_left-button_tutorial.jpg");
		preloadFlag = true;
	}
}