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Answers and rating deltas for

How can I make a pop up window (alertbox) if the input isn't valid?

Author Votes Δ
Fulgen 0 +0.86
Michael Coker 0 -0.19
Christos 0 -0.02
blackandorangecat 0 +0.84
Last visited: Aug 26, 2017, 10:28:27 AM