slicing the game screen into few sections.

Hi,
i’m trying to build an application which will go eventualy to HTML5 and android. i’m using the engine to present and switch 3d objects.

i need to slice the screen into 2 (or more) section, 1 (lets say the right side) is dedicated only for guy, the other slice is the preview. the preview itself dosent take the whole screen but just the size of the section (500px x 700px for example).

how do i approach it? the splitscreen is useless since its not a multyplayer and i want to control diferent sizes to each slice.

Thanx in advance
Amir.