I build a page in PHP that load some data from a MySQL database and then return a JSON representation of the data ( http://renkyaz.altervista.org/get_pcs.php). I tried to use this page as source for the jqTree on this page ( http://renkyaz.altervista.org/pcs.html) but it doesn't work.

So I added a JSON file on the same server ( http://renkyaz.altervista.org/get_pcs.json) that contain exactly the same data returned by the PHP page (you can check); then I created another page with a jqTree that load data from the JSON file ( http://renkyaz.altervista.org/pcs1.html) and this page is working perfectly...

Any idea about what I'm doing wrong?? Could it be a server related issue?

Thanks in advance!