function detectBrowser()
   {
      var ua = window.navigator.userAgent
      var msie = ua.indexOf ( "MSIE " )
      var numVerIE 
      

      if ( msie > 0 )      // If Internet Explorer, return version number
            numVerIE = parseInt(ua.substring (msie+5, ua.indexOf (".", msie )))
      if (numVerIE < 7)
            alert("ATTENTION!\nSite optimized for Microsoft Internet Explorer 7 or higher\nfor Mozilla Firefox 2 or higher\nMinimum resolution (1024x768 resolution)");
   }