Right now you can use the title attribute in the link code to add a label to the pop-up. However, the amount of text you can put there is limited by the width of the image. If you write too much it wraps around to behind the image.
What I'm wonder is there a way so we can at least display a second line of text in the label instead???
Sure I could adjust the size of the popup image itself, but if you have an imagine that is very narrow but tall, you can't make it wider without distorting the image itself.