<form action="functions/vote.php" method="post" name="vote-10">
    <input type="image" src="http://cdn.openwow.com/toplist/vote_small.jpg" border="none" onclick="document['vote-10'].submit(); window.open('http://www.openwow.com/vote=3077', '_BLANK'); return false;">
    <input type="hidden" name="points" value="10">
</form>