Hehe, well i'm pretty sure that you just click the 'window wider' button once... but i usually use the the little white box in the corner with the diagonal lines to drag the page to the size i want.
Oh, and if you're using a mac with atleast... OS panther on it, a good way to hide stuff from teachers is pressing F11, it'll make all the pages go to the sides and show you the desktop, and then you just press F11 again to get it back. Always works for me, because i press it and pretend to open something on the desktop.
Sounds like you're doing something similar to me in art, except i'm manipulating my own photos.
Well, i'm not quite sure of the layout in PC photoshop... but you should probably get the hang of the mac one pretty quickly.
I've never tried to make website entirely on photoshop (haha, i usually just use HTML because programs annoy me.
but then again i haven't made a website in a
long time.) i tried to use Adobe GoLive once, so difficult! Dreamweaver is probably the way to go.