I have a custom drop down that displays custom taxonomy in a hierarchical format. One drop down has all of the top level items and then that triggers a second drop down to appear. How can I have the drop downs stay on the selected option once it is selected? Here is my code.

PHP Code:
<?php $args = array(
    
'show_option_all'    => '',
    
'show_option_none'   => '',
    
'orderby'            => 'name'
    
'order'              => 'ASC',
    
'show_count'         => 1,
    
'hide_empty'         => 1
    
'child_of'           => 0,
    
'parent'             => 0,
    
'exclude'            => '',
    
'echo'               => 1,
    
'selected'           => 0,
    
'hierarchical'       => 0
    
'name'               => 'cat',
    
'id'                 => '',
    
'class'              => 'postform',
    
'depth'              => 1,
    
'tab_index'          => 0,
    
'taxonomy'           => 'classification',
    
'hide_if_empty'      => false,
    
'walker'             => ''
);

$tax_menu_items get_categories$args ); ?>