<script type="text/javascript" language="javascript">  
e=document.getElementsByTagName("TD");  
for(k=15; k<e.length;k++) {  
if(e[k].className=='posttdMessage') {  
s=e[k].innerHTML;  
while (s.indexOf('[p. s.]') != -1){  
s=s.replace('[p. s.]','<fieldset><legend><font style="font-size: 12px; font-family: Verdana; color: orange;"> P.S </font></legend><font style="font-size: 11px; font-family: Verdana; color: orange;">'); s=s.replace('[/p. s.]','</font></fieldset>');  
e[k].innerHTML=s;  
}  
} }  
</script>

<input accesskey="y" value="p.s." onclick="simpletag('p.s.','','','message',''); return false;" class="codeButtons" title="p.s." name="p.s." type="button">