// preload images
	nav1_0 = new Image();
	nav1_0.src = "images/nav_home_0.gif";
	nav1_1 = new Image();
	nav1_1.src = "images/nav_home_1.gif";
	nav2_0 = new Image();
	nav2_0.src = "images/nav_about_0.gif";
	nav2_1 = new Image();
	nav2_1.src = "images/nav_about_1.gif";
	nav3_0 = new Image();
	nav3_0.src = "images/nav_ourservices_0.gif";
	nav3_1 = new Image();
	nav3_1.src = "images/nav_ourservices_1.gif";
	nav4_0 = new Image();
	nav4_0.src = "images/nav_news_0.gif";
	nav4_1 = new Image();
	nav4_1.src = "images/nav_news_1.gif";
	nav5_0 = new Image();
	nav5_0.src = "images/nav_resources_0.gif";
	nav5_1 = new Image();
	nav5_1.src = "images/nav_resources_1.gif";
	nav6_0 = new Image();
	nav6_0.src = "images/nav_glossary_0.gif";
	nav6_1 = new Image();
	nav6_1.src = "images/nav_glossary_1.gif";
	nav7_0 = new Image();
	nav7_0.src = "images/nav_affiliations_0.gif";
	nav7_1 = new Image();
	nav7_1.src = "images/nav_affiliations_1.gif";
	nav8_0 = new Image();
	nav8_0.src = "images/nav_contact_0.gif";
	nav8_1 = new Image();
	nav8_1.src = "images/nav_contact_1.gif";
	nav9_0 = new Image();
	nav9_0.src = "images/h_t_estimate_0.gif";
	nav9_1 = new Image();
	nav9_1.src = "images/h_t_estimate_1.gif";
	nav10_0 = new Image();
	nav10_0.src = "images/h_t_file_0.gif";
	nav10_1 = new Image();
	nav10_1.src = "images/h_t_file_1.gif";
	nav11_0 = new Image();
	nav11_0.src = "images/testimonies0.gif";
	nav11_1 = new Image();
	nav11_1.src = "images/testimonies1.gif";
	
	var lastMenu = 0;
	var submenu = false;
	function swap2(imgNum, over) {
		if (over) {
			if (lastMenu > 0) {
				clearTimeout(to);
				doHide(lastMenu);
			}
			lastMenu = imgNum;
			document.images["nav" + imgNum].src = eval("nav" + imgNum + "_1.src");
			submenu = false;
			if (document.getElementById("sub"+imgNum)) {
				document.getElementById("sub"+imgNum).style.display = "block";
				submenu = true;
			}
		} else {
			if (submenu) {
				to = setTimeout("doHide("+imgNum+")", 1000);
			} else {
				to = setTimeout("doHide("+imgNum+")", 0);
			}
		}
	}
	
	function doHide(imgNum) {
		document.images["nav" + imgNum].src = eval("nav" + imgNum + "_0.src");
		if (document.getElementById("sub"+imgNum)) {
			document.getElementById("sub"+imgNum).style.display = "none";
		}
	}