I'm not a Xara expert although I've spent many hours with it. But my latest hitch is that I want to do Alt Text (1) to provide a caption if the picture doesn't go through, and (2) to show the text of a picture when the mouse hovers over it when it's there.

I do Web Properties,Image,"image caption (Alt Text)" but I can't understand why it works many times, but occasionally this text-appearing-when-mouse-hovers-over doesn't happen, even though I seem to have exactly the same settings on all the pictures I use it for. I've got the XWD handbook, but it never has the answers to things I want (because everyone else will know it!). I presume it's to do with layers, but I can't see any difference in my settings for those that work and those that don't.
I expect it's obvious, but I can't see it.

(re previous posts - Sorry not to have thanked previous responders for helping. I was too preoccupied with my problems to get back. Much appreciated and both have worked.)