//preload rollover images
if(document.images) {
	var img1 = new Image(); img1.src = "/graphics/nav/home_down.gif"; 
	var img2 = new Image(); img2.src = "/graphics/nav/visit_down.gif"; 
	var img3 = new Image(); img3.src = "/graphics/nav/involve_down.gif"; 
	var img4 = new Image(); img4.src = "/graphics/nav/belong_down.gif"; 
	var img5 = new Image(); img5.src = "/graphics/nav/serve_down.gif"; 
	var img6 = new Image(); img6.src = "/graphics/nav/grow_down.gif"; 
}