dropdown(including mouseout)

dropdown.js

document.getElementsByClassName('open')[0].addEventListener('mouseover',function(e) {
	var el,show;
	e = e || window.event;
	e.cancelBubble = true;
	if (e.stopPropagation) e.stopPropagation();
	el = document.getElementsByClassName('open')[0];
	show = el.getElementsByClassName('dropdown-menu')[0];
	show.style.display = "block";
},false);

var hide = function(e) {
	var el,hide;
	e = e || window.event;
	e.cancelBubble = true;
	if (e.stopPropagation) e.stopPropagation();
	el = document.getElementsByClassName('open')[0];
	hide = el.getElementsByClassName('dropdown-menu')[0];
	hide.style.display = "none";
}
document.getElementsByClassName('open')[0].addEventListener('mouseout',hide,false);
document.getElementsByClassName('open')[0].getElementsByClassName('dropdown-menu')[0].addEventListener('mouseout',hide,false);