Another Filter Dropdown Question

[peoplestring]

I can get a default category to show up but I cannot get the dropdown to show that category...rather it shows "Show All". I would love to get Show All as an option rather than the default filter status, when the calendar is showing a default category.

Here is my code...

if((!isset($_REQUEST['showCat'])) or ($_REQUEST['showCat']=="")){ $showCat="a|5"; } require ("calendar/calendar.php");