function displaySubMenu()
{
	
	$('.parent').click( function(){
	
		var parent_of = $(this).attr('parent_of');
		var sub_menu = $('#'+parent_of);
		
		if( sub_menu.css('display') == 'none')
		{
			sub_menu.slideDown();
		}
		else
		{
			sub_menu.slideUp();
		}
	});
}


$('document').ready(function(){
	displaySubMenu();

});