Anyone please advice me how to make confirm popup.
2 ways: a) you put a box on the exact position on your page with some buttons, mark it as Hidden On Load in prop. panel and then .show() it after some action. b) use a LIghtbox
thank you Giri Zano.
That is suxx!
Confirmation dialogbox is STANDARD thing, it must be available in API.
LightBox is ugly and monstrous thing for confirmations. 
Dmitri, since my comment from January, Wix window API has been enhanced with a Modal option. I have not tried it yet (and it takes you outside the wix environment), but for a simple dialog (“OK”), this might be what you need.