function performBrowserCheck()
     {        
        var browserErrorMessage = checkBrowserSupport();    
        var browserSupported =(browserErrorMessage == null)?true:false;
        //Check if browser is supported
        if( ( ! browserSupported ) && (! false)  )
        {           
           var redirect = getContextPath()+
              '/public/policy/BrowserRequirements.jsp';       
           if( browserErrorMessage != null )
           {
              //Always set a default message if not supported
              browserErrorMessage = (browserErrorMessage!=null)?browserErrorMessage:
                 'Browser configuration is not supported';
              redirect = redirect+'?message='+escape(browserErrorMessage);
           }
           window.location = redirect;           
        }       
     }
    


            /***********************************************************************
            * This will return an error messages, or null if no error.
            * @return An error message, or null if none. 
            ***********************************************************************/
            function checkBrowserSupport()
            {
               
               var result = 'The browser configuration is not supported';
               
                // Check if the browser version is supported
                if ( checkForSupportedBrowserVersion() ) 
                {
                        // Check if session cookies can be set
                        if (!checkSessionCookie()) 
                        {
                           result = 'Session cookies are not currently enabled';
                        }
                        else 
                        {
                            // Check if persistent cookies can be set.
                            if (!checkPersistentCookie()) 
                            {
                              result = 'Persistent cookies are not currently enabled';
                            }
                            else 
                            {
                                // The Browser passed all checks
                              result = null;
                            }
                        }
                }
                else 
                {
                    // OS, Browser and/or Browser Version are not supported
                    //  window.location = "BrowserNotSupported.html";
                }

               return result;
            }

            /***********************************************************************
            * Checks if supported browser version
            * Must be IE 5.0+, Firefox 1.0+, Netscape 7.0+
            * @return True if supported, else false.
            ***********************************************************************/
            function checkForSupportedBrowserVersion()
            {
               var validBrowser = false; //fail-safe

               //Check if Netscape 7.1 or greater
               if (navigator.appName=="Netscape" )
               {
                 if(parseFloat(navigator.appVersion)>= 7.1 )
                  {
                    validBrowser = true;
                  }
                  
                  /*********************************************************************
                   Added for Project 0003 for new Netscape browsers
                   appVersion: 5.0 (Windows; en-US)
                   userAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20050603 Netscape/8.0.2
                   ********************************************************************/
                   var getNSVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Netscape")).split("/")[1]
                  if( parseFloat(getNSVersion)>= 8  )
                  {
                    validBrowser = true; 
                    //document.write("Browser is: " + navigator.appName + ". Version: " + getNSVersion );
                  }


               }

               //Check if Firefox 1.0 or greater
               if(navigator.userAgent.indexOf("Firefox")!=-1){
                  var versionindex=navigator.userAgent.indexOf("Firefox")+8
                  if (parseInt(navigator.userAgent.charAt(versionindex)) >= 1)
                  {
                        validBrowser = true;
                  }
               }

               //Check if IE 5.0 or greater
               if (navigator.appVersion.indexOf("MSIE")!=-1)
               {
                  temp=navigator.appVersion.split("MSIE");
                  version=parseFloat(temp[1]);
                  if (version>=5)
                  { 
                     validBrowser = true;
                  }
               }
               /*******************************************************************
               Check if IE 11.0 or later 
               Code modified at 2013-11-19 by Wei
               *******************************************************************/
               var isAtLeastIE11 = !!(navigator.userAgent.match(/Trident/) && !navigator.userAgent.match(/MSIE/));
               if (isAtLeastIE11)
                  { 
                     validBrowser = true;
                  }
                  
               /*******************************************************************
               Check if chrome and version greater than 3.0. 
               Code modified at 2009-12-18 For 
               Project:
               F102: IE8 and other browser compatibilities, Safari, Firefox, Chrome
               *******************************************************************/
               if (navigator.userAgent.indexOf("Chrome") != -1  )
               {
                    var getCHVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Chrome")).split("/")[1]
                    
                    if( parseFloat(getCHVersion) >= 3)
                    {
                        validBrowser = true; 
                    }
               }
               
               /*******************************************************************
               Check if Safari and version greater than 4.0. 
               Code modified at 2009-12-18 For 
               Project:
               F102: IE8 and other browser compatibilities, Safari, Firefox, Chrome
               *******************************************************************/
               if (navigator.userAgent.indexOf("Safari") != -1 )
               {
                   var getSFVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Version")).split("/")[1]
                   if( parseFloat(getSFVersion) >= 4 )
                   {
                        validBrowser = true; 
                   }
               }

               /*******************************************************************
                   Check if Opera and version greater than 3.0. 
                   Code modified at 2009-12-18 For Opera browser
               *******************************************************************/
               
               /******
               if (navigator.userAgent.indexOf("Opera") != -1  )
               {
                    var getOPVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Version")).split("/")[1]
                    if( parseFloat(getOPVersion) >= 10 )
                    {
                        validBrowser = true; 
                    }   
               }
              *******/
 
               return validBrowser;
            }


            /***********************************************************************
            * This function is used from the functions checkSessionCookie() and
            * checkPersistentCookie() to read the value out of the cookie
            */
            function getValueFromCookie(cookieName)
            {
                //------------------------------------------------------------------
                // Define the cookie name to look for
                var cookieIndexName = cookieName + '="';

                //------------------------------------------------------------------
                // Check if any cookie exists in this document.
                if (document.cookie.length > 0) {
                    // A cookie is available in this document.

                    //--------------------------------------------------------------
                    // Look for the position of the cookie
                    var cookieStartIndex = document.cookie.indexOf(cookieIndexName);

                    //--------------------------------------------------------------
                    // Check if the appropriate cookie was found
                    if (cookieStartIndex != -1) {
                        // the CurrentUserCookie was found in the cookies of this
                        // document

                        //----------------------------------------------------------
                        // Look for the start and the end of the cookie
                        cookieStartIndex += cookieIndexName.length;
                        var cookieEndIndex
                                = document.cookie.indexOf('";', cookieStartIndex);

                        if (cookieEndIndex == -1) {
                            // the end of the cookie list is reached

                            cookieEndIndex = document.cookie.length-'"'.length;
                        }

                        //----------------------------------------------------------
                        // Return the value that was stored in the cookie
                        return unescape(document.cookie.substring(cookieStartIndex,
                                                                  cookieEndIndex));
                    }

                }
                //------------------------------------------------------------------
                // Return an empty string if nothing has been returned yet.
                return "";

            }

            /***********************************************************************
            * This function checks if session cookies can be set.
            */
            function checkSessionCookie()
            {
                //------------------------------------------------------------------
                // Set the needed variables
                var cookieName = "TruePassSessionTestCookie";
                var cookieValue = 'TruePassTestCookieDummyValue';
                var timeBeforeSettingCookie = new Date();

                //------------------------------------------------------------------
                // Set the cookie
                document.cookie = cookieName + '="' + cookieValue + '";';

                //------------------------------------------------------------------
                // Calculate how much time was needed to set the cookie
                var timeDifference
                    = (new Date()).getTime() - timeBeforeSettingCookie.getTime();

                //------------------------------------------------------------------
                // Check if setting the cookie lasted to long in Netscape. If
                // setting the cookie took longer than a few hundred miliseconds
                // it indicates, that the user had enabled the cookie warnings and
                // it took him some time to click on a button of the cookie warning.
                // Netscape does not work properly if cookie warnings are shown.
                // This is only a problem in Netscape and it does not occur in IE.
                if (navigator.appName.substring(0,9) != "Microsoft"
                    && timeDifference > 200) {

                    return false;
                }
                else {
                    //--------------------------------------------------------------
                    // Check if the cookie was set correctly.
                    if (getValueFromCookie(cookieName) != cookieValue) {

                        // reset the cookie
                        document.cookie = cookieName + '=""'
                                          + '; expires='
                                          + (new Date()).toGMTString();

                        // The session cookie was not set properly
                        return false;
                    }
                    else {
                        // reset the cookie
                        document.cookie = cookieName + '=""'
                                          + '; expires='
                                          + (new Date()).toGMTString();

                        // The cookie test succeeded
                        return true;
                    }
                }
            }

            /***********************************************************************
            * This function checks if persistent cookies can be set
            */
            function checkPersistentCookie()
            {
                //------------------------------------------------------------------
                // Set the needed variables
                var cookieName = "TruePassPersistentTestCookie";
                var cookieValue = 'TruePassTestCookieDummyValue';
                var timeBeforeSettingCookie = new Date();

                //------------------------------------------------------------------
                // Set the cookie
                document.cookie = cookieName + '="' + cookieValue + '";'
                                  + '; expires='
                                  + (new Date(timeBeforeSettingCookie.getTime()
                                              + 1000000)).toGMTString();

                //------------------------------------------------------------------
                // Calculate how much time was needed to set the cookie
                var timeDifference
                    = (new Date()).getTime() - timeBeforeSettingCookie.getTime();

                //------------------------------------------------------------------
                // Check if setting the cookie lasted to long in Netscape. If
                // setting the cookie took longer than a few hundred miliseconds
                // it indicates, that the user had enabled the cookie warnings and
                // it took him some time to click on a button of the cookie warning.
                // Netscape does not work properly if cookie warnings are shown.
                // This is only a problem in Netscape and it does not occur in IE.
                if (navigator.appName.substring(0,9) != "Microsoft"
                    && timeDifference > 200) {
                    return false;
                }
                else {
                    //--------------------------------------------------------------
                    // Check if setting the cookie was set correctly.
                    if (getValueFromCookie(cookieName) != cookieValue) {

                        // reset the cookie
                        document.cookie = cookieName + '=""'
                                          + '; expires='
                                          + (new Date()).toGMTString();

                        // The persistent cookie was not set properly
                        return false;
                    }
                    else {
                        // reset the cookie
                        document.cookie = cookieName + '=""'
                                          + '; expires='
                                          + (new Date()).toGMTString();

                        // The cookie test succeeded
                        return true;
                    }
                }
            }