<script type="text/javascript">          
e=document.getElementsByTagName("TD");          
for(k=0;k<e.length;k++) {          
if(e[k].className=='posttdMessage') {          
s=e[k].innerHTML;          
while (s.indexOf('[Table]') != -1) {          
s=s.replace('[Table]','<table width="100%" border="0" cellspacing="0" cellpadding="5" style="background-color:161618; border-top:1px dotted #898989; border-right:1px dotted #898989; border-bottom:1px dotted #898989; border-left:1px dotted #898989;"><tr><td style="width:25px; height:25px;background-repeat:no-repeat; background-position:5px 3px;"> </td><td><font style="font-size: 12px; font-family: Verdana; color: 898989;">'); s=s.replace('[/Table]','</font></td></tr></table>');          
e[k].innerHTML=s;}}}          
</script>

<input type="button" value="Таблица" onclick="simpletag('T able','','','message',''); return false;" class="codeButtons" title="Вставить Таблицу" name="Table"/>