how to make this shape ?

I've made the shape i want in paint :

http://cyberopa.homestead.com/files/untitled.jpg

can you guys tell me a fast way to make this in PS ?
thx

Now this is what I call a newbie question. :D

Just use the rectangular selection tool to draw the rectangle. Now use the poligonal lasso tool to cut the side of, hold shift to get a straight line.