old Cross Origin with iFrame and jQuery

iFrameCrossOrigin.js

$(function($) {
  if ($.xdomPost) { return; }
  var ifc = +new Date(),
      css = { position: 'absolute', top: '-1000px', left: '-1000px'},
      ieop = $.browser.msie || $.browser.opera && window.opera.version() < 9;

  $.xdomPost = function(url, data, options) {
    var opts = $.extend({appendTo: 'body'}, options);

    var inputs = '',
        ifr = 'ifr' + ifc++,
        iid = 'xdom' + ifr,
        fid = 'form' + ifr,
        $iframe = $('<iframe></iframe>', {
          id: iid,
          name: iid,
          css: css
        }),
        $form = $('<form></form>', {
          id: fid,
          name: fid,
          action: url,
          target: iid,
          css: css,
          method: 'POST'
        });

    if ( ieop ) {
      $iframe[0].src = 'javascript:false;document.write("");';
    }

    $.each(data, function(key, value) {
      inputs += '<input name="' + key + '" value="' + value + '">';
    });

    $iframe.appendTo(opts.appendTo);
    $form.append('<fieldset>' + inputs + '</fieldset>').appendTo(opts.appendTo);

    $form[0].submit();
  };

}(jQuery));