Player option to embed a background image in the html file?

Does Storyline enable one to specify a background image that will display on the HTML page (not on a slide)?  I don't see this option in the Player settings. (I know how to write code to do this but storyline will overwite that code every time you republish the page. ) It would be nice if one could just select a path to a background image within Storyline without having to manually edit html code to make it display.

Thanks.