I downloaded all the js file under the lib, why does not it work?

Hello!

For this example, http://dev.openlayers.org/sandbox/tschaub/feature/examples/drag-marker.html

I saved this webpage and aslo downloaded all the corresponding *.js files at http://dev.openlayers.org/sandbox/tschaub/feature/lib/ Then I orgnized them together, but the webpage just couldn’t work. The webpage error is: ‘OpenLayers’ is undefined.

In this example webpage, if I replace the js by , it can show the map, but the drag marker function does not work.

Please HELP!!!

Xintao