CSS Dropdown menu for the header- With Categories!

[Donn]

How about these CSS properties:
overflow:scroll;
overflow: Auto;

Would either work? Where in the CSS file should this go, if this IS correct?

I see the Div must have a height, in order for overflow to work.

div#dropMenu ul.level3 {max-height: 600 px; overflow: auto;}
div#dropMenu ul.level4 {max-height: 600 px; overflow: auto;}


I thought that this would work, but it does not.