Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content : Left fluid column content :
This layout is constructed using 2 floats of 50% each. One is floated left and the other floated right. Each float has a negative margin on the opposite side to the way the float is floated. The negative margin width is half the width that you want for your center column.
This will allow the floated center column to slide into place with a fixed width.
Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content : Right fluid column content :