I am not at my computer but if using CS 4 then select object with radial fill and click the radial tool
the gradient anodater will show up and you can adjust the radius the midpoints etc.
Oh sorry I forgot to mention I am using CS3.
Click and drag using the Gradient tool. If Smart Guides or Snap to Point is on and the centre point of the circle is showing you can click and drag from the centre to get a centre-aligned gradient.
Click and drag the Radial tool.
BTW you should state that you are not currently working in the current version before not after. It is very helpful that way.