<script type="text/javascript">  
e=document.getElementsByTagName("TD");  
for(k=15; k<e.length;k++) {  
if(e[k].className=='posttdMessage') {  
s=e[k].innerHTML;  
while (s.indexOf('[spoiler]') != -1){  
s=s.replace('[spoiler]','<fieldset><div style="margin: 3px; margin-top:1px;"><div class="smallfont" style="margin-bottom:5px"><a href="#" onclick="return spoiler_js(this);"><span><b>Показать / Скрыть текст</b></span><span style="display:none;"><b>Показать / Скрыть текст</b></span></a></div><div style=" margin-top:5px; margin-left:20px; padding:5px; border-left:2px solid #ff6600; border-top:1px solid #738499; border-right:1px solid #738499; border-bottom:1px solid #738499; background: #FFFFE0; display: none;">'); s=s.replace('
','</div></div></fieldset>');  
e[k].innerHTML=s;  
}  
} }  
</script>  

<script type="text/javascript">  
function spoiler_js(obj) {  
var obj_content = obj.parentNode.parentNode.getElementsByTagName('div')[1];  
var obj_text_show = obj.getElementsByTagName('span')[1];  
var obj_text_hide = obj.getElementsByTagName('span')[0];  

if (obj_content.style.display != '') {  
obj_content.style.display = '';  
obj_text_show.style.display = '';  
obj_text_hide.style.display = 'none';  
} else {  
obj_content.style.display = 'none';  
obj_text_show.style.display = 'none';  
obj_text_hide.style.display = '';  
}  
return false;  
}  
</script>

<input type="button" value="spoiler" onclick="simpletag('spoiler','','','message',''); return false;" class="codeButtons" title="Оффтоп" name="spoiler"/>