Liquid Design Problem

Hi everyone. I am trying hard to use liquid design in my websites, so when I have a gallery of thumbnails, I want the number of rows of thumbnails to adjust according to the window size, avoiding horizontal scrolling. If you go to this url: www . surecarehomehealth . com you will see that resizing the window will do what I want it to. However, if you click on the first thumbnail, after opening that page, the thumbnails no longer adjust as desired. It seems that having that large image on top prevents this, but why? I can't figure it out. I can't see what would be preventing the thumbnails from collapsing to fit inside the window. Can anyone tell me why this is? Thanks.