I believe that what you need to do is to wrap the menu control with a
element that has a float CSS style rule applied.
Here is a tutorial that should help you understand what I mean by "float":
http://css.maxdesign.com.au/floatutorial/
Applying CSS styles can be pretty tricky, and there are a lot more considerations than just a simple application. You need to take into account the entire layout requirements for the page, and understand how all the elements interact with each other.