div change with javascript

[cip6791]

Hi,

 

I am trying to make a div change when an image that is in the same div is clicked. I m not too familiar with javascript, so I hope somebody can help me. This is the page : http://pixeltennis.com/produse_html/roc_hydra_summer.html

 

I already used javascript in the submenu that changes the big blocks into three categories. I also want to change the gray(right) div when one of the little gifs  on the bottom is pressed. That way it will show a little description of the product.

 

Thanks.