Help inserting menu divider

I am trying to insert a divider between the main menu and the slide out submenu as shown on this site:

My file is:

Thanks for the help,

Thanks so much…worked perfectly.


You could just a right border if that’s what you meant.

#dhtmlgoodies_menu ul{border-right:5px solid #000}

Of course you’d need to move the submenu a bit closer to it as it seems a long way away.