$(function(){

	var wsTimer = null;
	$(window).scroll(function(){
		clearTimeout(wsTimer);
		wsTimer = setTimeout(onScroll, 50); // avoid too many calls
	});
	
	// hide menu on clicking outside of it:
	$('body').click(function(ev){
		if (!$(ev.target).closest('.OEWEMenu').length) { // clicked element is not inside any menu
			$('.OEWEMenu').find('.OESZ_WEMenuGroup').stop().hide(); // hide all menus
		}
	});
	
	function onScroll() {
		var wHeight 	= $(window).height(),
			wTop 		= $(window).scrollTop(),
			wBottom 	= wTop + wHeight;
		
		$('.OEWEMenu').each(function(){ // Hide popup menus on scroll when they are no longer visible
			var $menu = $(this).find('.OESZ_WEMenuGroup');
			$menu.stop(); 							// end any ongoing animation
			if ($menu.css('display') != 'none') { 	// currently visible
				if ($menu.offset().top > wBottom-10 || ($menu.offset().top+$menu.height()) < wTop+10) { // out of visible area
					$menu.hide();
				}
			}
		});		
	}

});