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I have 4 icons on the bottom of my screen that remain when the screens are moved left or right. Can these icons be moved, I would like to replace the Messaging one with my Email icon? Android 2.3.3.

Thanks, but it doesn't work; when long pressing the Email icon on the homescreen, the dockbar is replaced by the 'Remove' bar.

You didnt mention what phone you are in, but my guess is Samsung with stock TouchWiz?
Go into app drawer, press menu button and select edit. Drag the messaging icon out of the dock below, then drag the email app onto it. Press back, and you're done.