手风琴菜单，首次点击展开，如果扩展子菜单，请转到URL

I have a script which expands a menu, but what I want it to do is expand on the first click and then once the sub-menu is expanded, I want the expanding link to go to actually go to the URL specified if it's clicked again. Here is the code I have so far:I have a script which expands a menu, but what