I had an example of an old question on my HD: an image in a relief popup window. In the editor you can import an image.
If you mean the javascript messagebox (I think that's what you mean): no, I don't think an image is possible.
It seems the msgbox is made with a javascript alert() function, which doesn't allow images.
(did a test)
Yes, the msgbox is made with javascript alert().
The only way is to make your own popups in javascript (google for "window.open") and fill it with your own html.
I had an example of an old question on my HD: an image in a relief popup window. In the editor you can import an image.
If you mean the javascript messagebox (I think that's what you mean): no, I don't think an image is possible.
It seems the msgbox is made with a javascript alert() function, which doesn't allow images.
(did a test)
Yes, the msgbox is made with javascript alert().
The only way is to make your own popups in javascript (google for "window.open") and fill it with your own html.