5. Using the Google Mapplets API rather than the Google Maps API we’ve outlined in the above steps will allow you to create applications that are installed on to the Google Maps site itself. Visitors to the main Google site will then be able to view the content that you’ve created and installed.
6. The first step is to add the Developer tools to Google Maps. Follow the link to 'Install the Developer Mapplet'. The Developer Mapplet will then appear under the My Maps tab when you visit maps.google.com. You can also install a scratchpad and reference guide.
7. To start writing your own Mapplet, follow the instructions at click here. Here you’ll be provided with a simple extensible markup language (XML) example that you can modify to suit your needs. Most of the instructions are similar to those for the general API, but you’ll need to include some additional lines of code.
8. Your Mapplet must be available on a public web server to be viewed. Put the link maps.google.com/ig/add?synd=mpl& pid=mpl&moduleurl=
See also: How to add a Google map to your web page