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;

// changeImage() and preload() functions for rollovers

	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")
		}
	}