Radial Gradient?

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JA2
 #1
Function Ovals (Shades)

Local Col,Pos#,Wid,A

For A = 0 To 255
	Col	= 255-A
	Pos	= A*0.5
	Wid	= 255-A
	Color Col,Col,Col
	Oval Pos,Pos,Wid,Wid,True
Next

End Function

How could I adjust this function to use the shades parameter? I want the darkest shade to always be black, and the lightest to always be white. I need the function to work out the shades in between...