How do you change the size of the camera image?

How do you change the size of the camera image in blender 2.5?

It’s pretty self explanatory, in the render settings under Dimension tab / Resolution


Wiki for rendering (for earlier versions of blender but the same parameters can easily be picked out in blender 2.5)
http://wiki.blender.org/index.php/Doc:Manual/Render

wow thx sooooo much