wp_dropdown_categories problem – Show roots URL

Hello,

Any help much appreciated!

I am using wp_dropdown_categories in a form like this:

<form action="<?php bloginfo('url'); ?>" method="post">
<?php $select = wt_get_category_ID();
wp_dropdown_categories("class=large&&show_count=true&selected=".$select.""); ?>
<input id="submit" type='image' src='<?php bloginfo('template_directory'); ?>/images/search.png'/></div>

</form>

The problem is the URL stays showing domainname.com each time I select a category and click search. This causes a problem when the category has many posts and requires pagination.

I am using the PageNavi plugin and when I click to view page 2 it doesn’t work as it goes to domainname.com/page/2/ instead of domainname.com/category/page/2/. (works great the rest of the time, just not with this form as it stays on root url).

Do you know how I could set up the form so it actually goes to the true url when I search rather than staying at the root.

An idea is to submit the form to a a different file to process the search but im not sure.

Thanks in advance for any help.