function lastNavItem(){
	var dropSelector = 'ul';
	var nav = document.getElementById('nav');
	if(nav){
		var _parentEl = [];
		var _li = nav.getElementsByTagName('li');
		for(var i=0; i<_li.length; i++){
			if(_li[i].parentNode == nav) _parentEl.push(_li[i]);
			if(_li[i].getElementsByTagName(dropSelector).length) _li[i].className += ' has-sub-level';
		};
		_parentEl[0].id = 'first-item';
		_parentEl[_parentEl.length-1].className = 'shop';		
	};
};

if (window.addEventListener) window.addEventListener("load", lastNavItem, false);
else if (window.attachEvent) window.attachEvent("onload", lastNavItem);