<script type="text/javascript">    
// BB-code by Sklyar    
e=document.getElementsByTagName("TD");    
for(k=0;k<e.length;k++) {    
if(e[k].className=='posttdMessage') {    
s=e[k].innerHTML;    
while (s.indexOf('[admin ]') != -1) {    
s=s.replace('[admin ]','<table width="100%" border="0" cellspacing="0" cellpadding="5" style="background-color:#f5f5f5; border-top:2px dotted #491f1f; border-right:2px dotted #491f1f; border-bottom:2px dotted #491f1f; border-left:2px dotted #491f1f;"><tr><td style="width:50px; height:50px; background-image: url(http://i008.radikal.ru/0804/f4/215ea483f241.png); background-repeat:no-repeat; background-position:5px 3px;"> </td><td><font style="font-size: 25px; font-family: Verdana; color: red;">'); s=s.replace('[/admin ]','</font></td></tr></table>');    
e[k].innerHTML=s;}}}    
</script>

<input type="button" value="admin" onclick="simpletag('admin','','','message',''); return false;" class="codeButtons" title="Вставить админ-сообщение" name="admin"/>