Delete Object in Alfresco 5.1

Hi All,

I need to delete a node object as well as a forum post in Alfresco 5.1 but I don't see more the repo webscript

In Alfresco 4.0.e I had the possibility to invoke the REST API:

DELETE /alfresco/service/api/node/{store_type}/{store_id}/{id} (see screenshot)

I try to create a new repo webscript using cmisServer root object but receive an error "cmisServer is not defined"

Is there an alternative way to do the same thing in Alfresco 5.1?

Regards
Vincenzo