1. First please make sure, that the server, where PD4ML binaries are, is able to resolve “www.xxx.com” into a correct IP address and able to establish a connection to it. Often servers within intranet do not “know” their external (Internet) names, IPs or routing to the IPs.
If the resources are on the same server where PD4ML is, it makes no practical sense to use fully specified URLs. I would suggest to use relative paths “../images/my.png” (note: there is no leading slash) or absolute web paths “/images/my.png”, but for the second option you need to invoke pd4ml.useServletContext().
2. z-index works only for absolutely positioned elements.
3. Currently you may apply absolute positioning to block elements (i.e.