how do i set the browseraction popup width and height?

here is my problem: http://img687.imageshack.us/img687/5391/88030081.gif

here is my simple page:

URL fixing provided by none

what do I need to do? I see other extensions with width and height set to just fine, and i only enter some little text and I get linebreak, this is the only thing I get stucked in developing my extension- this is just an example of what happens