Add class to MENU ITEMS USING JS

add_action('wp_head','menu_theme_fix_js');

function menu_theme_fix_js() { // break out of php ?>
	<script type="text/javascript">
		jQuery(document).ready(function($) {
    		$("ul.sub-menu").addClass("dropdown-menu");
		});
	</script>
<?php } // break back into php