Sliding box content problem

Sliding box content problem

Hi, I've created a sliding box that when you click on the 'a' the content slides from right to left and disappears.

http://spencercoons.com/projects/twitter_hide/

but the problem is that the copy inside the div starts to wrap underneath itself when the box slides over.

I tried an 'overflow: hidden' but couldn't get any result.

I'm a novice at javascript in general so any help would be really appreciated!

Thank you.