Website Resolution with CSS & DIV tags

Hi,

My site is made now with CSS and the use of DIV Tags.

I have three columns,

COLUMN 1 COLUMN 2 COLUMN 3
-------- ----------- --------
MENU CONTEXT ADS


I have divided it into percentage, column 1 being like 15%, column 2 50% and column 3 15%

When viewing the page on a bigger or smaller resolution the boxes obviously stretch or get narrower.

Is there a way to LOCK column 1 and 3 to its original size and have only the middle column expand?

It looks bizzare when viewing the page to see that the menu for column 1 and 3 are too "wide".

Can someone please shed some light on these things?

thank you!

yeah set a width thats not a percentage on both the left and right cols...

col 1 width:300px
col 3 width:300px