var el = document.getElementById("dd1");
	var el2 = document.getElementById("dd2");
	el.onclick = drop_open;
	el.onmouseout = drop_close;
	el2.onclick = drop_open;
	el2.onmouseout = drop_close;
	
	function drop_open(event) {
		this.className += ' dd_open';
	}
	
	function drop_close(event) {
	
		var current, related;
	
		if (window.event) {
			current = this;
			related = window.event.toElement;
			}
		else {
			current = event.currentTarget;
			related = event.relatedTarget;
			}
		if (current != related && !contains(current, related))
			this.className = 'dropdown';
		}
				
	
	function contains(a,b) {
		while (b.parentNode) {
			b = b.parentNode;
			if (b == a)
				return true;
			}
		return false;
		}