Код:

<script type="text/javascript">
function Transform_Code_Box_in_HTML(aX){
var TemLnk=aX.replace(/^(.*viewtopic\.php\?id=\d*).*$/ig,"$1");
var PstId=aX.replace(/^.*viewtopic\.php\?id=.*(#p\d+)$/ig,"$1");
var L=document.URL.replace(TemLnk,'');
if(L!=document.URL&&(L.slice(0,1)).search(/\d/ig)==-1 ){ 
L=$("div.topic "+PstId);
if(L.length==1){
var Lhtm=L.find(".post-content .code-box:first .scrollbox pre").text();
L.find(".post-content .code-box:first").replaceWith(Lhtm)
}}}
function Demo_HTML(Ts){var Ll=Ts.parents(".htmldemo").find(".code-box .scrollbox pre").text();
Ts.parents(".htmldemo").after('<div class="demHtml">'+Ll+'</div>');Ts.replaceWith(DemoButt0);
}
$(document).ready(function() {
$("#pun-viewtopic .post .code-box").each(function(){
if($(this).text().indexOf('<!--HTML-->')!=-1){
$(this).wrap('<div class="htmldemo"></div>')
$(this).replaceWith($('.htmldemo').text().split('<!--HTML-->')[1]);
}
});
});
</script>