How to get a Google maps SQL->XML->map marker tutorial to work in WordPress

So I figured out the issue. I wasn’t familiar enough with how urls are handled in XMLHttpRequest. I needed to change

downloadUrl("http://wp-content/themes/oxygen-child/phpsqlajax_genxml3.php", function(data) {

to

downloadUrl("http://www.theworldsflgiht.com/wp-content/themes/oxygen-child/phpsqlajax_genxml3.php", function(data) {

Thanks for the help everyone!