Código de proibir css & link externo em spoiler no chatbox nao funciona

Código:

var f='#frame_chatbox';jQuery(document).ready(function(){jQuery(f).replaceWith('<iframe src="/chatbox" id=frame_chatbox width=100% height=100% scrolling=no frameborder=no border=0></iframe>')});setInterval(function(){jQuery(f).contents().find('.msg table').remove();jQuery(f).contents().find('.msg .msg span').attr('style','');jQuery(f).contents().find('.msg .msg a').each(function(){jQuery(this).replaceWith('<dl class="codebox spoiler"><dt style=cursor:pointer>Spoiler:</dt><dd><div class=spoiler_content>'+jQuery(this).html()+'</div></dd></dl>')})},100);

O tutorial só funciona se chatbox estiver no início ou no final da página do fórum.

<script src="http://code.jquery.com/jquery-latest.js"></script>
<iframe name=chatbox id="framejqs" src="/chatbox" frameborder=0 width=900 height=400 scrolling=auto></iframe>
<script type="text/css">
#framejqs {
bottom: 1px !important;
margin-bottom: 1px !important;
}
</script>
<script>setInterval(function(){jQuery('#framejqs').contents().find('#chatbox span').css({'font-size':'11px'})},0)</script>
<script>setInterval(function(){jQuery('#framejqs').contents().find('span.msg span a').removeClass()},0);</script>
<script>setInterval(function(){jQuery('#framejqs').contents().find('#chatbox table').remove()},0)</script>
<script>setInterval(function(){jQuery('#framejqs').contents().find('#chatbox span.blur').remove()},0)</script>
<script>setInterval(function(){jQuery('#framejqs').contents().find('span.msg span a').attr('href','SEU_FÓRUM').html('Links somente em spoiler!')},0);</script>
<script>setInterval(function(){jQuery('#framejqs').contents().find('#chatbox img').remove()},0)</script>
<script>setInterval(function(){jQuery('#framejqs').contents().find('#chatbox span marquee').remove()},0)</script>
<script> jQuery('a#button').click()</script>

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