19. A method as in claim 17 , wherein if the rules specify that content associated with a particular node is to be blocked, then the corresponding node is removed from the document object model.
19. A method as in claim 17 , wherein if the rules specify that content associated with a particular node is to be blocked, then the corresponding node is removed from the document object model. 20. A method as in claim 19 , wherein children nodes of the removed node are relocated to depend from a different node.