I don't see anything wrong right off. Be sure you are using the most recent files. Here are a couple of points though.
The error should be indicating that the jquery.tablednd_0_5.js file is not being loaded properly. Make sure that the file is good and referenced correctly.
Glitches in executing my reorder code incorrectly can set all the sort values to zero. I have had that multiple time when debugging. Make sure you have valid unique values in the sort column. When testing, if this is happening, you can execute a simple sql statement to fix that during development: "UPDATE products SET ProductoOrden = ProductID WHERE 1=1" That ensures a valid test when debugging.
It looks like this page suffers from the bugs in the earlier (and hopefully resolved) releases of data bridge in that the file was not properly generated. I see XML code that should be removed or altered by the extension when the page is generated (e.g.
) You may want to start from scratch on this page.
If that doesn't help, I'd need access to the site. The code is working for me right now, so while not as well tested as the last version, I know it works.