//preload menu images
	if(document.images) {
		var img1 = new Image(); img1.src = "images/nav/but_contact_b.gif";
		var img2 = new Image(); img2.src = "images/nav/but_homepage_b.gif";
		var img3 = new Image(); img3.src = "images/nav/but_insPrograms_b.gif";
		var img4 = new Image(); img4.src = "images/nav/but_ourStaff_b.gif";
		var img5 = new Image(); img5.src = "images/nav/but_partners_b.gif";
		var img6 = new Image(); img6.src = "images/nav/but_safety_b.gif";
		var img7 = new Image(); img7.src = "images/nav/but_about_b.gif";
	};

	function swap(imgID, imgSrc) {
		if(document.images) {
			document.images[imgID].src = imgSrc;
		};
	};