Adding a pop up to a HTML5 canvas

Hello.

Looking for some advice please?

I need to create a web banner which has a line of copy. When the viewer clicks on the copy, a pop up/overlay of copy will appear with a message. When the viewer has read it, they will click a cross to close the overlay/pop up. I also need to add a click tag to the file.

Is the above possible? Any advice/tutorials would be great appreciated.