$(document).ready(function(){
						   
	// hide second level lists of videos
    $('li ul').each(function() {
		$(this).hide();
	});
	
	// hide all open second level list and show only selected second level list
	$('a.category').click(function() {
		$('a.category').each(function() {
			$(this).next('ul').hide();
			$(this).css('font-weight','normal');
		});
		$(this).next('ul').show();
		$(this).css('font-weight','bold');
		$(this).focus();
		return false; 
	});
	
});