Unfortunately you have misunderstood the techniques needed and changed your elements form floated to absolute and that won't work. The columns themselves need to be floated as before.
What are the column colours or graphics that you need each column to be?
You don't seem to have any need for anything special as all columns seem to be white and if so and the answer I gave in the first post would have solved that without needing any additional code.
If you did want 3 column colours then the faux image could have been applied to that wrapper as mentioned before without changing the html or any other code.
Lastly if you did not want to use an image for the columns colours (although I don't know why as its the easiest option) then you can use my absolute overlay method but it means adding 3 empty elements to the html. These empty elements hold the column colours and sit under the floated content. Nothing else has to change.
Revert your page back to floated and if you can let me know what each column colour is supposed to be then I'll give you some example code.