Zimlet :search contact

[ersecchio]

hi!

I have realized an zimlet that search into Address Book, but I have a problem.
The called soap is:

var prova= "John";
var soapDoc = AjxSoapDoc.create("SearchRequest", "urn:zimbraMail");
var node = soapDoc.set("types","contact");
var query = soapDoc.set("query",prova);

but I have a problem because the zimlet search only String that have equals "John", but i would that the zimlet search also the contact with the string "Jo" , "hn" etc . an example "Joh" , "ohn" etc.

what is the attribute that insert into the called soap for search an occurrence of "joh" "ohn" etc