Code
<script>
e=document.getElementsByTagName("TD");
for(k=15; k<e.length;k++) {
if(e[k].className=='posttdMessage') {
s=e[k].innerHTML;
while (s.indexOf('[Youtube]') != -1){
s=s.replace(/\[Youtube\]([^\[]+)\[\/Youtube\]/ig,'<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/$1"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/$1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>');
e[k].innerHTML=s;
}
} }
очень интересный скрипт