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if you want a number to pop up with every rollover or click action, that is very easy - simply put a listener on that action for that icon to pop up a text string containing the number.
The Google API lets you easily choose a different color for each icon...and whether or not it has a dot in the center of it.
You would think that you could choose one with a number in the center instead
But I can't figure it out without disecting the whole thing in photoshop and turning it in to a 4 hour project