How can I take a PNG and increase its opacity?

I have a PNG file with some transparency. I need to paint in some opacity in the alpha channel. How can I achieve this?
In the Channels window, I can access the R, G and B channels just fine, but I need to access the Alpha channel. I need to make my image more opaque in places.
Any ideas?

You could record an action that will make it easier in cs3.
Not the most elegant solution and only works to recover partial trnsparency, but might get you by until your given an upgrade to cs6.
The action below saves the transpency to a new channel, then at the end makes a layer mask from the transparency in the original layer and deletes the saved channel.
Then you paint on the layer mask or delete the layer mask.

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