var IE = navigator.appVersion.indexOf("MSIE")>0;
			var msieIndex = navigator.appVersion.indexOf("MSIE") + 5;
			var version = parseFloat(navigator.appVersion.substr(msieIndex,3))
			var IE4 = IE && version>=4 && version<5;
			var IE5 = IE && version>=5;
			var Macintosh = navigator.userAgent.indexOf('Mac')>0;
			
			preload('btnadvoff','/img/nav-adv-off.gif');
			preload('btnadvover','/img/nav-adv-over.gif');
			preload('btnadvon','/img/nav-adv-on.gif');
			preload('btnprodoff','/img/nav-prod-off.gif');
			preload('btnprodover','/img/nav-prod-over.gif');
			preload('btnprodon','/img/nav-prod-on.gif');
			preload('btnaboutoff','/img/nav-about-off.gif');
			preload('btnaboutover','/img/nav-about-over.gif');
			preload('btnabouton','/img/nav-about-on.gif');
			preload('btnsupoff','/img/nav-sup-off.gif');
			preload('btnsupover','/img/nav-sup-over.gif');
			preload('btnsupon','/img/nav-sup-on.gif');
			preload('btnsignupoff','/img/nav-signup-off.gif');
			preload('btnsignupover','/img/nav-signup-over.gif');
			preload('btnsignupon','/img/nav-signup-on.gif');
			
			function preload(imgObj,imgSrc) {
				if (document.images) {
					eval(imgObj+' = new Image()')
					eval(imgObj+'.src = "'+imgSrc+'"')
				}
			}

			function changeImage(layer,imgName,imgObj) {
				if (document.images) {
					if (!IE && layer!=null){
						
						eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src')
					}
					else {
						document.images[imgName].src = eval(imgObj+".src")
					}
				}
			}
			
			function loadLogin() {
				win = window.open("/login.asp","htmlwindow","height=200, width=200, toolbar=no");
			}
			
			function checkListForm(frm) {
				if (frm.email.value.indexOf("@") == -1 || frm.email.value.indexOf(".") == -1) {
					alert("You must enter a valid email address.")
					frm.email.focus();
					return false;
				}
				else {
					return true;
				}
			}