Problem solving

Google Maps API Tutorial

When your page doesn’t work, the first thing to do is look to see if there are any Javascript errors reported.
In Firefox, launch the “Javascript Console” from the “Tools” menu.
In IE, double-click on the error icon in the status bar.
The error messages can often provide clues to what’s gone wrong

Don’t forget to check the “potential pitfalls” associated with each of these tutorial sections.