var player = GetPlayer();
var oWebObject = g_oWebObjects["999"];
oWebObject.Div.style.zIndex = "900";
I got the 3rd line from this post: https://community.articulate.com/discussions/articulate-storyline/webobject-and-storyline-variable
As the first post above says, it doesn't work in HTML5, and later in that post a method is suggested but I can't figure out how to make it work. Since that post has a couple of different tangents in it and is a bit old, I thought I'd start fresh.