2. The reading system of claim 1 , further comprising a zoom module for a user to perform a zoom in/zoom out operation on the document units.
2. The reading system of claim 1 , further comprising a zoom module for a user to perform a zoom in/zoom out operation on the document units. 3. The reading system of claim 2 , wherein the zoom in/zoom out operation is performed by providing a larger image of the document unit that is hovered by a cursor.