I have a fully functioning messaging system on my website. I want to evolve this by having a box popup altering members when they have a new message.

It would say something like "You have a new message, would you like to view?". You would be able to click Yes or No.

How would I go about doing this? Never tried anything like this before!

Teşekkürler

UPDATE. I am very inexperienced using the technologies required here. How would I go about ensuring this works on every page? What code would I include? This is something I need to improve on as it opens up so many more possibilities!