How to set context for operators in 2.5?


Is there any explanation how to set context before calling operator from script?
I.e. if I want to call bpy.ops.image.reload(), then I have to set context for correct image but how to do this?

Here’s a brief guide to the context. It doesn’t cover setting the active image, in fact it doesn’t cover setting the active anything yet, but I expect you can do it selecting the image object.

The problem is that this not show how to call operators like bpy.ops.image.reload() and others.
I know how to get active objects etc. but this operator context seems to be related with gui context.

did you sort this request ? found a workaround ?
I have the same need