1 <script type=”text/javascript”> 2  <!– 3 var Browser = { 4  ’isIE’ : (navigator.userAgent.indexOf(‘MSIE’) >= 0) && (navigator.userAgent.indexOf(‘Opera’) < 0), 5  ’isFirefox’ : navigator.userAgent.indexOf(‘Firefox’) >= 0, 6  ’isOpera’ : navigator.userAgent.indexOf(‘Opera’) >= 0 7 }; 8 //alert(navigator.userAgent); 9 alert(Browser["isIE"]);//isIE10 alert(Browser["isFirefox"]);//isFirefox11 alert(Browser["isOpera"]);//isOpera12 –>13 </script>