Finally got it to work... I changed the DOCTYPE from <html xmlns="http://www.w3.org/1999/ xhtml"> to <!DOCTYPE html> and everything worked at that point.
As an aside, I'm using Gabriel Svennerberg's book but trying a different workflow. For example, instead of coding the markers in the .js file, I create the marker locations in Google Maps and then export a .kml file that's linked by the .js file. My next step I will pursue will be modifying the marker parameters in the .kml file itself. I don't know if this is the way to apply markers to a map, but it's more intuitive for me to create as much as possible using Google Maps. -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.