code: public void removeCustomTag(String virtual) throws SecurityException {
  	checkWriteAccess();
  
  	Element mappings = _getRootElement("custom-tag");
  	Element[] children = XMLConfigWebFactory.getChildren(mappings, "mapping");
  	for (int i = 0; i < children.length; i++) {
  	    if (virtual.equals(createVirtual(children[i]))) mappings.removeChild(children[i]);
  	}
      }
docs: delete a customtagmapping on system
  
  @param virtual
  @throws SecurityException