Try this...
Code:
<form action="https://vborg.vbsupport.ru/search.php" method="post" target="_blank">
<input type="hidden" name="s" value="" />
<input type="hidden" name="do" value="process" />
<tr class="firstalt">
<td><a href="http://www.vbulletin.org/" target="_blank">vBulletin.org Search</a></td>
<td><input type="text" class="bginput" name="query" size="30" tabindex="1"> <span id="submitrow"><input type="submit" value="vB.org"></span></td>
</tr>
</form>