Problem with column heights - TinyFluidGrid

Hi!
I´m somewhat of a newbie to CSS positioning, especially frameworks, and in the quest for knowledge on the topic I decided to try out the http://www.tinyfluidgrid.com/ as a basis for setting up a simple page.

However, I have run into a problem: I want the 3 columns to behave independently concerning the height of the content like this example: http://watland-berntzen.no/nuTool/imgs/3columnLayout.png, (heeey, niiice!)so that regardless the size of your image height the images will align vertically.

However, the grid makes each "row" of images align horizontally creating a gap/whitespace in the middle column like this: watland-berntzen.no/nuTool/

Is there a way to solve this without hacking it all to pieces, or do I have to use another approach?

The ccs:
http://watland-berntzen.no/nuTool/grid.css

Many thanx for advise on this!