function overImg(id) 
{
	document.getElementById(id).src = "images/" + id + "_over.gif";
}

function outImg(id) 
{
	document.getElementById(id).src = "images/" + id + ".gif";
}

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

function preloadImages() {
	if (document.images) {
		a = newImage("images/menu_home_over.gif");
		b = newImage("images/menu_aboutus_over.gif");
		c = newImage("images/menu_products_over.gif");
		d = newImage("images/menu_expertise_over.gif");
		e = newImage("images/menu_contact_over.gif");
	}
}