Regarding the alt tags, an empty alt tag is just as invalid as no alt tag, and there's currently no functionality to edit text for the alt tag. So, I guess what I could do is put the powerphrase in the alt tag. Would that settle it for you?

Additionally, the inline CSS has to be.. there.. because it's written dynamically with certain settings as they're entered on the add/edit form. I believe C5 has a way to handle that, but I haven't looked into it. I may in the future.

The non-self-closing images will not change. Only in XHTML is it required. HTML4 and HTML5 doesn't do self closing tags, and I'd rather be future friendly with HTML5 than cater to XHTMLs demand for self-closed image tags. That being said, alt tags also aren't required in HTML5 (though it's still highly recommended), but that's something I'll probably add in regardless.

Agreed on the future proofing - the endings should be as generic as possible.

I've amended the view.php file to add a generic alt tag and the ending /> and this now is working, but using the powerphrase would be great - that would give some level of control to allow these to be edited, but you'd need to add an option not to display them as overlays (I use this to show a series of images for client testimonials and there is no need to use the titles or phrases).

The inline styles are a pain, if you could figure out putting them in the header or using an attached CSS file that would be awesome.

Thanks for your help in this :)

To fix the "style" html validation error I changed the view.php and put the styles directly with a style="bla" tag param into the according tags.

Thats dynamic and valid ;-)