dropdown.php

<?php
    $args = array(
		'orderby'          => 'display_name',
		'who'             => 'authors',
		'exclude'          => '17,10,20,22,6,19' // string
	);
	$users = get_users($args);
	?>
	<select name="user" id="user" class="">
	<?php
	foreach ( $blogusers as $user ) {
    	echo '<option value="'.$user->username.'">' . esc_html( $user->display_name ) . '</span>'; // I'm not sure if username is right
    }
    ?>
    </select>

jumpmenu.js

$('#user').change(function() {
    window.location = 'http://www.bond-us.com/blog/author/'+this.value;
});