Spry Menu bar positioning and Div tags.

Hey guys!
I've sliced up and imported my page layout from Photoshop into Dreamweaver. Looks good. I'm trying to insert a Spry Menu Bar, which got me hitting my head against the wall.
I've deleted a slice where my content is going to be, and am trying to insert a div tag, and put the same image that i've deleted as a background of that Div tag. It's messing up and shifting all the slices around. I thought, if i delete a slice, and insert a div tag, i could put a Spry menu Bar in there. When i go to insert Spry menu bar, it puts the bar, but i cannot find a way to have that menu bar centered on my page, instead of being stuck to the left of the page.
Any help is appreciated, and buying some beer is guaranteed