Topmenu dropdown changes


In dropdown.css i have made changes so that 4-columns should be the fullwidth.

Now I have some problem in topmenu_dropdown.tpl to make is works as it doesn't display it nicely.

Has anyone tried or can anyone give me some pointers how to change topmenu_dropdown.tpl, so that when having 4 catagories it would show fullwidth and that 5th, 6th, etc, category will go in next line.