How to put a small picture on a big picture by coordinates

From: Hast
Date: 29 Jun 2004
Time: 06:56:04
Remote Name:


How to put a small picture such as a trademark or a logo on top of a big picture given the location is known. This is just like to put a marker of star on yahoo search map in the found address. I would prefer to do it on fly - when I need to add a small picture I do it when web is presented. Thanks a lot!