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if (UltraEdit.document.length > 0)  // Is any file opened?
{
   // Is the file not a new, unnamed file?
   if (!UltraEdit.activeDocument.isName(""))
   {
      var sFileNameWithPath = UltraEdit.activeDocument.path;
      var sFileNumber = sFileNameWithPath.replace(/^.+_(\d\d\d)\.\w+$/,"$1");
      // Does the file name end with an underscore and a number with 3 digits?
      if(sFileNumber != sFileNameWithPath)
      {
         // Convert file number to string using decimal system and increment by 1.
         var nFileNumber = parseInt(sFileNumber,10) + 1;
         // Convert the incremented file number back to string using
         // decimal system and append this string after two leading zeros.
         var sNewFileNumber = "00" + nFileNumber.toString(10);
         // New file number string should be just the last 3 digits.
         sNewFileNumber = sNewFileNumber.substr(-3);
         sFileNameWithPath = sFileNameWithPath.replace(/\d\d\d(\.\w+)$/,sNewFileNumber+"$1");
      }
      else
      {
         // Insert _000 before file extension.
         sFileNameWithPath = sFileNameWithPath.replace(/(\.\w+)$/,"_000$1");
      }
      UltraEdit.saveAs(sFileNameWithPath);
   }
   else
   {
      UltraEdit.messageBox("Error: Saving file with incremented number is not possible for a new file!");
   }
}