I have a question. I have a picture the shape of an arbitrary quadrilateral and I need to deform it to fit into a rectangle. It's the facade of a skyscraper, looked from perspective, and I need to "straighten" it out to use as a texture.

I have Ulead Photoimpact installed but I can get a hold of Corel Draw 8 or Photoshop in a day or two. If you can guide me through in any of theese programs. Thanks in advance.

Here's how the shape looks like, and how the final result should be:

In photoshop use Free Transform, Skew or Perspective to acheive that result. :)