2005FPW 21" monitor - PictureInPicture with DVI-D and D-Sub connectors

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I have a Dell 21" 2005FPW monitor.
I have the DVI-D connector from the 21" monitor plugged into my
Dimension 9100 PC. My (older) other PC has a D-Sub connector plugged
into the 21" monitor as well.
Is there a way I can split the screen (PiP) so that I can view both PCs
at the same time instead of pressing the left-most button on the monitor
and switching between the two?
If I press the 2nd left most button on the monitor I can see the PiP
settings but only S-Video and Composite are showing in white whilst DSub
and DVI are greyed out.
What am I doing wrong or is this not possible to view both PCs at the
same time in split screen (PiP) mode.
Thanks very much.
PS - XP Home edition

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