When you hear the word "popup" in relation to rendering by a browser what often-used scripting language jumps to mind?

Did I hear "javascript" ... or maybe "ECMAScript" ?"

So perhaps the next thing your should do is see if you see some js in the source .html... and if you do, use Super Search to see the many closely related questions and answers you find here.

That's one aspect of the self-help the Monastery's norms expect from a SOPW. Another norm, well covered in On asking for help and How do I post a question effectively? is that we expect to see (enought of) your code and data (both formatted inside <c>...</c>) that we need not use our psi, crystal balls or mind-reading techniques to help you.