bugfix in XmlHttpRequest.send's parameters encoding
bugfix in XmlHttpRequest.send's parameters encoding

Ignore-this: 702005053da6304d4eb317b64adb137e

darcs-hash:20100708114254-8ea92-a50d37e6ee83102a1fc05207c51637a6a40de51a

OCamlPro-Henry/js_of_ocaml,OCamlPro-Henry/js_of_ocaml,OCamlPro-Henry/js_of_ocaml,alainfrisch/js_of_ocaml,OCamlPro-Henry/js_of_ocaml,OCamlPro-Henry/js_of_ocaml,alainfrisch/js_of_ocaml,alainfrisch/js_of_ocaml,alainfrisch/js_of_ocaml,alainfrisch/js_of_ocaml