mac = (navigator.appVersion.indexOf("Mac")>-1) ? true : false; // Mac
ie = (document.all) ? true : false; // IE
safari = (navigator.appVersion.indexOf("Safari")>-1) ? true : false; // Safari
gecko = (navigator.userAgent.indexOf("Gecko/") > -1)? true : false; // Gecko

function copyright() {
	y = new Date().getFullYear();
	document.write('2000-'+y);
}