how to chenge the default method of showing category list?

hi friends.

i wanted to know how i can change the default showing method of the category page to "grid" instead of "list"?
by default it's set to list.

i mean ,for a viewer, as the first time this list will be shown as grid.

Hi,
I think you need this tutorial
http://forum.opencart.com/viewtopic.php?f=20&t=39580