var browser_type=navigator.appName
var browser_version=parseInt(navigator.appVersion)
//if NS 4+
if (browser_type=="Netscape"&&browser_version>=4)
document.write("");
//if IE 4+
else if (browser_type=="Microsoft Internet Explorer"&&browser_version>=4)
document.write("");
if (navigator.appVersion.indexOf('Mac') != -1)
{
document.write("")
}