Preview:
 $('.header_items li:has(ul)').addClass('parent'); 
 
    $('.burger-icon a').click(function() {
        if ($(document).find('.nav').hasClass('active')){
            $(document).find('.nav').removeClass('active');
            $('body').toggleClass('mobile-open'); 
		$('.header_items li.parent ul').slideUp(250);
		$('a.child-triggerm').removeClass('child-open');    
        }
        else {
            $(document).find('.nav').addClass('active');
        }
        $('body').toggleClass('mobile-open'); 
        $('.header_items li.parent .sub-menu li').removeClass('child-open');
		$('.header_items li.parent ul').slideUp(250);
        return false;
     });	 

     $('.header_items li.parent ul').before('<a class="child-triggerm"><span></span></a>');
	
     $('.header_items a.child-triggerm').click(function() {
         $(this).parent().siblings('li').find('a.child-triggerm').removeClass('child-open');
         $(this).parent().siblings('li').find('ul').slideUp(250);
         $(this).next('ul').slideToggle(250);
         $(this).toggleClass('child-open');
         return false;
     });

function StickyHeader() {
var headerHeight = jQuery('#header').innerHeight();
jQuery('body').css("padding-top", headerHeight);
}
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