Shortcut for "Image Size" in Photoshop Mac?

I’m using Photoshop CS on Mac OSX 10.4 and I’m wondering if there is anyway to use the keyboard keys to access the “image size” window in Photoshop. The comparison in Windows would be that you can hold down the “alt” key, and hit [i] and then [i] again (taking you into the [i]mage menu, then selecting the [i]mage size option). I realize it must be something simple, but i haven’t found a comparable shortcut, and when editing multiple pictures, it becomes uber frustrating after a while to constantly have to keep using the mouse, whereas I wouldn’t need to on a Windows machine.