var isDOM=document.getElementById?1:0; var isIE=document.all?1:0; var isNS4=navigator.appName=='Netscape'&&!isDOM?1:0; var isIE4=isIE&&!isDOM?1:0; var patrn = new RegExp("MSIE 5."); var isIE50 = patrn.test(navigator.userAgent) ? true : false; function BrwsrChk () { if ((isNS4) || (isIE4) || (isIE50)) { alert('The sign up pages require Internet Explorer 6.0 or higher OR Netscape 6.0 or higher. Please upgrade your browser.'); return false; } return true; }