Search Problems not allowing any pagination

I have coded my own search page template because I was having problems getting search.php to play ball properly.

I have the search page template working perfectly aside from the pagination.
If I use a hard coded version or a plugin it will not show anything at all.
Here is my Query code

And the code for the pagination:

<div id="searchnav">
<?php if (function_exists("pagination")) {
    pagination($additional_loop->max_num_pages);
} ?>
</div>

Thanks in advanced ??