I want to change the size of the catalog image "small_image" in mytemplate/template/catalog/product/list.phtml

But it doesn´t work.

So i killed the code of list.phtml from my template and the base folder, but nothing happen.

If I kill the php script or the xml line in catalog.xml, the catalog is empty. Work!

When I kill these two list.phtml files, why the catalog is still working. Which file do I need to edit? Which files create the productlist of the catalog too?