PHP multiselect and page navigation

[career]

I assume there's more than one place $sorturl is used

Yes, it's also used for sorting on page, standart vb code from my template:

<a href="$sorturl&amp;order=desc&amp;sort=voteavg" rel="nofollow">$vbphrase[rating]</a> $sortarrow[voteavg]</span>
....
<a href="$sorturl&amp;order=asc&amp;sort=title" rel="nofollow">$vbphrase[thread]</a> $sortarrow[title] /
....
<a href="$sorturl&amp;order=asc&amp;sort=postusername" rel="nofollow">
.....

Thanks for your advice, kh99. But I didn't plan to use javascript.

Just can't realize how to make construct_page_nav() work without long url and so many vars in it. Would be great to have a working url for 2nd page like test.php?do=show&page=2 or something but not containing too much variables like now.

--------------- Added [DATE]1336134729[/DATE] at [TIME]1336134729[/TIME] ---------------

btw, this code just modified mostly from moderation.php and template "moderation_threads".
VB 3.8
I've added multiselect for choosing multiple forums, that's it.