Search and replace REL attribute with jQuery -

I want to search the link and change the rel attributes if rel currently equivalent attachement .

I have a code so far:

  $ ("href"). Each (function (index) {$ (this) .attr ('rel', 'group');});    
 
 
 If you are trying to test some relay value (assuming "Attachment"), all you have to do is:  
  $ ('a [rel = "attachment"]'). Attr ('rel', 'group');   
 It says that  & lt; A & gt;  rel = "attachment" ,  rel  with "elements"> for the "group".  
 On the other hand, if you have all the elements with the  href  attribute, then you will use something like this  
  $ ('[Href] [rel = "attachment"]') attr ('rel', 'group') .;