var bNetscape4plus = (navigator.appName == "Netscape" && navigator.appVersion.substring(0,1) >= "4"); var bExplorer4plus = (navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.substring(0,1) >= "4"); function advhide() { if ( bNetscape4plus ) { document["divLinkButton"].visibility = "hidden"; } else if ( bExplorer4plus ) { divLinkButton.style.visibility = "hidden"; } }