mkdir() problem!

im trying to use the mkdir function but i''ve hit a wall..it cant seem to create more than 1 folder at a time.. for instance, if i were to code: mkdir("c:/windows/desktop/folder1/"); that would work, but if i code mkdir("c:/windows/desktop/folder1/subfolder1/"); and the folder1 doesn''t exist, the function doesn''t work.. so how do i make mkdir automatically create every folder in the string?