One thing to add/correct:
plQuad[1]=plQuad[1]+100
will change the point by a 100 pixels in both the horizontal and vertical
directions (see list manipulation lingo).
To change only one direction use:
plQuad[1]=plQuad[1]+point(100, 0)
or plQuad[1]=plQuad[1]+point(0, 100)
or even plQuad[1]=plQuad[1]+point(100, 50)
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