css overlaping divs !

[aBnest]

Hi..
i'm just starting put with css and stumbled upon a problem:

i have 2 divs on my main page, one that is set to float right, and the other is fixed to the left of the screed, and has a defined width. the problem is that if i resize my browser too much, the div that floats to the righ just overlaps with the other div. what i want to do is that if you resize the browser until the 2 divs meet, the floated one does't overlap, but it stops right near the edge of the other one.
can anyone help me with this?

thanks

[DDD]

give the one to the right a margin-left equal to the width of the div on the left. That way you dont have to float