Код:

<script>
function addMod(str,from,internal){
var pos=0,pos2=0,newpos=0
if((pos=str.indexOf("[mod]",from))==-1) return str;
if((pos2=str.indexOf("[/mod]"),pos+5)==-1) return str;
newpos=str.indexOf("[mod]",pos+5)
if(newpos<pos2 && newpos!=-1) str=addMod(str,pos+5,true)
if((pos2=str.indexOf("[/mod]",pos+5))==-1) return str;
str=str.substring(0,pos)+makeMod(str.substring(pos+5,pos2))+str.substring(pos2+6,str.length)
if( str.indexOf("[mod]")!=-1 && internal==false) str=addMod(str,0,false)
return str}

function makeMod(txt){
txt="<br><div style=\"margin: 19px; padding: 1px; backgroundcolor=#444444; border-top: 1px dotted #000; border-right: 1px dotted #000; border-left: 1px dotted #000; border-bottom: 1px dotted #000;\"><TABLE cellpadding='0' cellspacing='0'><TD align='middle' background='http://savepic.net/2660476.png' vAlign='center' width='18%' ><FONT color='#6e8d33' size='2' style='FONT-FAMILY: times' border-right: '1px dotted #000' title='Предупреждение'><B>&nbsp;Administration<br>memo&nbsp;</B></FONT></TD></TD><TD vAlign='middle'>"+txt+"</TD></TABLE></div><br>"
return txt}


if(document.URL.indexOf("viewtopic.php")!=-1){
elm=document.getElementById("pun-main").getElementsByTagName("div")
for(x in elm) if(elm[x].className=="post-content"){
var post=elm[x]
post.innerHTML=addMod(post.innerHTML,0,false)}}
</script>
<style>
#button-mod {background-image:url('http://i029.radikal.ru/0804/26/e430252a0faf.png'); padding:0; line-height:0; background-position:center; background-repeat:no-repeat; height:26px; width:100%}
</style>
<script type="text/javascript">
if((document.getElementById("navadmin")) && (form=document.getElementById("form-buttons")))
form.getElementsByTagName("tr")[0].insertCell(18).innerHTML="<img src='/i/blank.gif' title='Предупреждение' id='button-mod'  onclick=\"bbcode('[mod]', '[/mod]');\"/>"
</script>