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Browser detect for IE versions

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  1.  
  2. function isIE(versionNumber) {
  3. var detect = navigator.userAgent.toLowerCase();
  4. if(!(navigator && navigator.userAgent && navigator.userAgent.toLowerCase)) {
  5.   	        return false;
  6.   	    } else {
  7.   	        if(detect.indexOf('msie') + 1) {
  8.   	            // browser is internet explorer
  9.   	            var ver = function() {
  10.   	                // http://msdn.microsoft.com/workshop/author/dhtml/overview/browserdetection.asp
  11.   	                // Returns the version of Internet Explorer or a -1
  12.   	                // (indicating the use of another browser).
  13.   	                var rv = -1; // Return value assumes failure
  14.   	                if (navigator.appName == 'Microsoft Internet Explorer') {
  15.   	                    var ua = navigator.userAgent;
  16.   	                    var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
  17.   	                    if (re.exec(ua) != null) {
  18.   	                        rv = parseFloat( RegExp.$1 );
  19.   	                    }
  20.   	                }
  21.   	                return rv;
  22.   	            };
  23.   	            var valid = true;
  24.   	            // if the version can be found and the version is less than our version number it is invalid
  25.   	            if ((ver > -1) && (ver < versionNumber)) {
  26.   	                valid = false;
  27.   	            }
  28.   	            return valid;
  29.   	        } else {
  30.   	            return false
  31.   	        }
  32.   	    }
  33. } 
  34.  
  35.  

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