I would do it like this:

<dataset name="ds" request="false"  src="http://www.../sr.php"; />

and then your button code would be:

<button text="Submit" onclick="sendit()">
  <method name="sendit">
      var d = canvas.datasets.ds;
      var p = new LzParam();
      p.addValue('qs', 'stuff' ,true);
      d.setQueryString(p);
      d.doRequest();
  </method>
</button>

(Warning: this is untested email code.)

HTH,

Dave

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