excluding cats in drop down cats

this is what I have as the parameters:
<?php dropdown_cats(optionall, ‘all’, ‘sort_column’,’sort_order’, optiondates, optioncount,hide_empty, optionnone,selected, hide); ?>

I am trying to include cats Id number 12,19 & 11 and exclude cats ID numbers 23,24,& 25

This is my code:
<form action=”<?php echo $PHP_SELF ?>” method=”get”>
<h2>Choose a specific category of articles from the drop down list:</h2>
<?php dropdown_cats(0,’all’,’name’,’asc’,0,0,1,true,’12,19,11′,’23,24,25′); ?>
<input type=”submit” name=”submit” value=”view” />
</form>

But it is not restricting the categories, however the dropdown is working. Any suggestions?

Thanks,
Kathy