It is possible, if you're talking about what I think you are.
Its called a "liquid" layout. By setting your divs' width to %'s not pixels the page's content will expand to keep a constant percentage of the page used.
Example would be....
CODE
#my_magical_div {
width: 50%;
}
#Socks_smell {
width: 50%;
}
Using that stylesheet the two divs, when placed into your page, will each expand to hold 50% of your screen real-estate.
(your %'s don't have to add up to 100 by the way, any more than 100 and you'll have a horizontal scroll any less and you'll just have white space.)EXAMPLE!Is that what you mean? Maybe? Perhaps?