Image > Image Size

Uncheck constrain proportions so you can change the width and not the height, or the other way around.

Or leave it check so by just changing the one, it changes the other to match =]

Edit:
Quote Originally Posted by Paint4life View Post
In Photoshop go to Image>Image size
Lol beat me to it, WS is gonna have a hissy fit >_<
I gotta stop leaving detail =[