List Certain Categories only plus their sub categories

Ok, i appreciate you pointing me int he right direction, quick question if anyone can help again. I will paste my code below, the problem is I know I put the exclude command in there wrong and the display categories even if there is nothing in them wrong. Could someone help me clean it up a little bit. Here is my code:

<li id="categories">
	<h2><?php _e('Posts by Category'); ?></h2>
	<form action="<?php bloginfo('url'); ?>/" method="get">

<?php
	$select = wp_dropdown_categories('show_option_none=Select category&show_count=1&orderby=name&echo=0 exclude=9,23,16,15,3,1);
	$select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
	echo $select;
     echo $hide_empty=0;
?>
	<noscript><input type="submit" value="View" /></noscript>
	</form>
</li>

Here is the original code:

<li id="categories">
	<h2><?php _e('Posts by Category'); ?></h2>
	<form action="<?php bloginfo('url'); ?>/" method="get">
<?php
	$select = wp_dropdown_categories('show_option_none=Select category&show_count=1&orderby=name&echo=0');
	$select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
	echo $select;
?>
	<noscript><input type="submit" value="View" /></noscript>
	</form>
</li>

Thanks guys!

Halls,

I really appreciate your help! I almost have it getting 2 problems. As soon as I added the exclude tag it made 2 drop down menus, but it is excluding the categories I don’t want which is good. Then I added the command to display categories that do not have posts in them. Final addition was the hierarchy command but that made the categories with no entry disappear. I will post my code so either you or anyone may see it.

<li id="categories">
	<h2><?php _e('Posts by Category'); ?></h2>
	<form action="<?php bloginfo('url'); ?>/" method="get">
<?php
	$select = wp_dropdown_categories('show_option_none=Select category&show_count=1&orderby=name&echo=0 &exclude=9,23,16,15,3,1&hierarchical=1&hide_empty=0 ');
	$select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
	echo $select;
?>
	<noscript><input type="submit" value="View" /></noscript>
	</form>
</li>

Thanks again!

Sorry for all the posts another update though. I got it working I had another space in the code. All is working well now! Thank you for all of your help halls!