code: function(url, params, doc, target)
  	{
  		return new mxXmlRequest(url, params).simulate(doc, target);
  	}
docs: Function: submit
  
  Submits the given parameters to the specified URL using
  <mxXmlRequest.simulate> and returns the <mxXmlRequest>.
  Make sure to use encodeURIComponent for the parameter
  values.
  
  Parameters:
  
  url - URL to get the data from.
  params - Parameters for the form.
  doc - Document to create the form in.
  target - Target to send the form result to.