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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:[color=red]161618[/color]; 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: [color=red]898989[/color];">'); s=s.replace('[/Table]','</font></td></tr></table>');   
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<input type="button" value="Таблица" onclick="simpletag('Table','','','message',''); return false;" class="codeButtons" title="Вставить Таблицу" name="Table"/>