Exclude cat id in Drop Down Menu

[tssfacts]

Hello,

I am trying to exclude some cat id in the drop down menu on the sidebar.php I have spend hours upon hours reading posts and the tutorial on this issue.

My coding in sidebar.php is different than in the tutorial. Here is the coding I have


<div id="sidebar">

<ul id="sidebarwidgeted">

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('Sidebar Top') ) : ?>




<li id="quick-search" class="widget">
<h2>Quick Search</h2>

<?php wp_dropdown_categories('show_option_none=Select category&hierarchical=true'); ?>
<script type="text/javascript"><!--
var dropdown = document.getElementById("cat");
function onCatChange() {
if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {
location.href = "<?php echo get_option('home');
?>/?cat="+dropdown.options[dropdown.selectedIndex].value;
}

}
dropdown.onchange = onCatChange;
--></script>



I have placed this code <?php wp_dropdown_categories('orderby=name&title_li=&dep th=2&exclude=7'); ?> everywhere I can think to put the stupid thing.

Am I missing a another php file that I need to add this exclude code to?

Please tell me what I need to do ( and where I need to do it :) to to exclude cat id from drop down menu from the sidebar.

Many thanks for your help.

Towanda