"Blueprint's default width for all layout is set to 950px consisting of 24 columns (width units)." Is there something similar that also works with dynamic scre

"Blueprint's default width for all layout is set to 950px consisting of 24 columns (width units)." Is there something similar that also works with dynamic screen sizes? For example I want to create a two column based layout and make the first coloumn at least 4 to at most 6 width units large and let the last column takeup the rest, depending on current screen size of the user's browser window.