Sure its possible, I have converted such shaders before...

However, this shader only appears to give you the pixel shader, and you need a vertex shader to go with it. There is a link on the page to a more complete implementation, just get that play around with it. However, sometimes its frusturating to convert such sahders, and often it wont seem to work.

Frankly i think Steep parrallax, relief mapping, etc are not so great as they are very slow.