code: function autoFill(q, sValue){
      // autofill in the complete box w/the first match as long as the user hasn't entered in more data
      // if the last user key pressed was backspace, don't autofill
      if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) {
        // fill in the value (keep the case the user has typed)
        $input.val($input.val() + sValue.substring(lastWord(previousValue).length));
        // select the portion of the value not typed by the user (so the next character will erase)
        $.Autocompleter.Selection(input, previousValue.length, previousValue.length + sValue.length);
      }
    }
docs: fills in the input box w/the first match (assumed to be the best match) q: the term entered sValue: the first matching result