Need a simple yes/no dialog window on raid join to combat log

[Azza2]

Hello,

Hopefully my request is quite simple, it doesn't need to be anything fancy, but I would like a dialog window to appear in the center of the screen on joining a raid asking if I wish to combat log this raid - with yes/no buttons below it.

If Yes is selected then it should run /combatlog, if No is selected then no action should be taken.

It would be greatly appreciated since I forget to combatlog our raids a lot for WWS reports. Thanks