How to add multiple kml files to google map web page?

I have two kml files that I would like to add to my google map, one
file represents sanitary sewer manholes and the other sanitary sewer
pipes. I can only get one to show up. My code is below:

var kml = new GGeoXml("http://niraengineers.com/map/harr_sanmh.kml");
var kml2 = new GGeoXml("http://niraengineers.com/map/
harr_sanpipe.kml");
map.addOverlay(kml);
map.addOverlay(kml2);

My website: map.niraengineers.com

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