I see in another thread that the following code would solve my problem:
<?php
$xmlDoc = new DOMDocument();
$xmlDoc->load("http://www.fusioncharts.com/Gallery/Data/Col3D1.xml");
header('Content-type: text/xml');
echo $xmlDoc->saveXML();
?>
However, I'm not a programmer, and I have no idea where to put this or what it means. Does it go in the head of the php file? If I have multiple charts on a page, do I duplicate the code for each chart? What do I do with the myChart.setDataURL, which is what currently points to the file?
Thanks