set overprint fill whose fill color is myColor to false 

tell application "Adobe InDesign CS3" 
	tell active document 
		set myPaper to swatch "Paper" 
		set myOther to last swatch 
		 
		repeat with aStyle in all paragraph styles 
			if fill color of aStyle is myPaper then 
				tell aStyle 
					set fill color to myOther 
					set overprint fill to false 
					set fill color to myPaper 
				end tell 
			end if 
		end repeat 
		 
		repeat with aStyle in all paragraph styles 
			if stroke color of aStyle is myPaper then 
				tell aStyle 
					set stroke color to myOther 
					set overprint stroke to false 
					set stroke color to myPaper 
				end tell 
			end if 
		end repeat 
		 
		repeat with aStyle in all character styles 
			if fill color of aStyle is myPaper then 
				tell aStyle 
					set fill color to myOther 
					set overprint fill to false 
					set fill color to myPaper 
				end tell 
			end if 
		end repeat 
		 
		repeat with aStyle in all character styles 
			if stroke color of aStyle is myPaper then 
				tell aStyle 
					set stroke color to myOther 
					set overprint stroke to false 
					set stroke color to myPaper 
				end tell 
			end if 
		end repeat 
		 
	end tell 
end tell