bossterms API
    ---------------
    
    This small API allows you to get keywords connected with a search term 
    using Yahoo's BOSS API
    
    You have several URL parameters:
    
    term:     the search term (needs to be words and spaces, everything else 
              is filtered out)
    callback: the name of a JavaScript method to wrap the JSON return in - 
              JSON-P I guess you can call it.
    format:   If format is set to html the API returns an HTML list. If
              it isn't set, it returns a JSON object with a JavaScript header.
              This allows you to use this script as a form action (with a 
              hidden for field called format) and override this normal 
              behaviour with JavaScript.
               
     The JSON output has the following properties:
     
     term:     Your search term
     keyterms: An array of the keywords 
     html: The keywords as an HTML list

     Try it out:
     
     Get keywords for "donkey" as HTML:
     bossterms.php?term=donkey&format=html
     Get keywords for "kitten" as JSON:
     bossterms.php?term=kitten
     Get keywords for "puppies" as JSON and call "bark":
     bossterms.php?term=puppies&callback=bark
     
     Chris