<?if($PAGE_ID$='threadpage')?>      
<script type="text/javascript">      
function go(){      
page=$('#gopage').val(); // X-3me ~  http://x-3me.ru      
ftid=location.href.split('/')[4];      
fid=ftid.split('-')[0];      
tid=ftid.split('-')[1];      
document.location.assign('/forum/'+fid+'-'+tid+'-'+page);      
}      
</script>      
<form>      
На страницу:         
<input id="gopage" type="text">         
<input value="Перейти" onclick="go();" type="button">         
</form>      
<?endif?>