JavaScript Pop-up with buttons, need sugestions!

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Javascript

I have a .JS with a lot of code.

And when I execute a function choose() { here! }

I want to appear in some kind of popup, some buttons, with three choices for example - I have already done the actions for those buttons.

I need that the most efficient possible, but with good looking.

I already used "standart" solutions like the confirm box:

var answer = confirm ("Are you having fun?")
if (answer)
alert ("Woo Hoo! So am I.")
else
alert ("Darn. Well, keep trying then.")

that's not suitable to me because I the popup I want is to choose one between three colours! So I would like to post a square it a color (the button) and I cant do it with that solution!


What could I do?

Important thing: I need to stay on JS, no HTML allowed :)

Dont know JS enough to know what to look, so I appreciate your help !