Trying to create "old crackled" paper image

I’m still trying to put a website together but I can’t seem to create a convincing piece of paper in photoshop:puzzle: … Could anyone help me out here?

What I want to do is make an image of a piece of old “grungy” paper, taped or nailed or stapled to the background.
It should look old but not medieval if you know what I mean.

On this site is more or less an example of what I mean:

I especially like the “cracked” borders