quicksearch member in $show array

[helltonic]

Hello, could somebody please tell me the criteria for when 'quicksearch' would be a member of $show? Is it just when the user is logged in? Or is there some other criteria that has to be met?

<a id="navbar_search" href="/forums/search.php$session[sessionurl_q]">Search</a>
<if condition="$show['quicksearch']">
    <script type="text/javascript">
        vbmenu_register("navbar_search", 1);
    </script>
</if>

If I try to see all the members of $show in PHP, it does not include 'quicksearch':

PHP Code:

echo('[');
print_r($show);
echo(']'); 


Prints:

[Array ( [search_engine] => [old_explorer] => [left_column] => 1 [center_column] => 1 [right_column] => 1 [editor_css] => [xfire] => )]