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Four alerts should appear after this text becomes visible. Each message is created by one of the three onload handlers define here. The order of execution of these handler differs from browser to browser.
Here is an article http://simon.incutio.com/archive/2004/05/26/addLoadEvent that discusses adding multiple onload handlers to a page.
I have tested several of these browser versions, and received reports regarding the success and failure with others.
Firefox
2.0.0.4 on Windows XP Pro SP2
1.5.0.7 on Windows XP Pro SP2
1.5.0.6 on Windows XP Pro SP2, Fedora Core 5
1.5.0.4 on Windows XP Pro SP2
1.5.0.2 on Windows XP Pro SP2
1.5.0.1 on Windows XP Pro SP2
1.5 on Fedora Core 5 (pre-release)
1.0.7 on Windows XP Pro SP2
1.0.6 on Fedora Core 4
Internet Explorer
7.0.5730.11 on Windows XP Pro SP2
7.0.57 on Win XP SR2 (thanks Britain Express)
6.0.2900.2180.xpsp_sp2_gdr.050301-1519 on Windows XP Pro SP2
6.0.2800.1106 on Windows 98 SE
5.5 SP2 (thanks 58sniper)
5.01 SP2 (thanks 58sniper)
4.01 reported a javascript error on page load, and only runs the initPage() handler (but doesn't run Google Maps either) (thanks 58sniper)
3.0 didn't show alerts (but doesn't run Google Maps either) (thanks 58sniper)
Mozilla
1.7.11 on Fedora Core 5 (pre-release)
1.7.10 on Mac OS 10.4.1 (thanks to John at http://maps.huge.info/)
1.7.7 on Windows XP Pro
Opera
9.02 on Windows XP Pro SP2
9.01 on Windows XP Pro SP2
9.00 on Windows XP Pro SP2
8.54 on Windows XP Pro SP2
8.51 on Windows XP Pro SP2
8.02 on Windows XP SP2 (thanks 58sniper)
Netscape
8.02(?) on Windows XP SP2 (thanks 58sniper)
Konquorer
3.5.3-0.4.fc5 on Fedora Core 5 (Some oddities with scroll wheel and log window)
3.4.2 on Fedora Core 4 (It shows alerts, but doesn't run Google Maps)
Learn about the Google Maps API in the API documentation. Discuss the Google Maps API on Google Groups.