MOUSE

I got a mouse unit and it works great in SVGA mode and it is suppost to
work well in mode 13h....but When ever I try to use the mouse unit
the mouse point x and y position is way off...and when I try to draw a
pixel were the poiter was it skips every other vertical line on the X
axis...why is this? I tried to make it so I just use the mouse point x
and y and draw my own cursor but I am having difficulty...please help.

                                -thanx
                                Jeremy