function preload(imgObj,imgSrc) {
					if (document.images) {
						eval(imgObj+' = new Image()')
						eval(imgObj+'.src = "'+imgSrc+'"')
					}
				}

				function switchImg(imgName,imgObj) {
					if(document.images) {
						document.images[imgName].src = eval(imgObj+'.src')
					}
				}


				preload('home','../icon/home.gif');
				preload('homeO','../icon/homeO.gif');
				preload('faq','../icon/faq.gif');
				preload('faqO','../icon/faqO.gif');
				preload('sitemap','../icon/sitemap.gif');
				preload('sitemapO','../icon/sitemapO.gif');
				preload('contact','../icon/contact.gif');
				preload('contactO','../icon/contactO.gif');