If you want to include that as a parameter for processing, place it as hidden field instead of submit's onclick()
Also, i'm assuming you're submitting the form using GET method since you have the parameters with '?' as delimiter?
<form method='get' action='ProductionMain.php' id='packages'>
<input type='hidden' name='PackageID' value='1' />
<!-- blah blah blah -->
<input type='submit' name='submit' value='View Details' />
</form>
Edit: wrong form attributes