Shiela - it was just a joke :D I don't know if it is tilted or not ! Andreas knows I think it is a superb image ;) and I was just bringing a little light relief to MAS :) However I can tell you the easy way to straighten them in PSP. Use the straighten tool ! Click on the straighten tool found on the tool bar [with the perspective & deform tools] and then align the line along a known vertical or horizontal in the pic and PSP will do the rest for you. It will even crop the image to suit too if you tick the box for it to do that.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html