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dhtmlxAjax.get outputResponse

When I enter more than 1 line of code in the following function nothing shows on the page (suggesting an error in the cose).

    function outputResponse(loader) {
        if (loader.xmlDoc.responseXML != null)
var params = loader.doXPath("param");
document.getElementById("title").innerHTML = params[0].firstChild.nodeValue;
        else
            alert("Response contains no XML");
    }

    function doOnRowSelected(id) {
        dhtmlxAjax.get("detail.jsp?ID=" + id, outputResponse);
    }

Can you show how to get the innerHTML value sets.

The xml is formatted the same as in your online example.

Thank you.

  function outputResponse(loader) {
  if (loader.xmlDoc.responseXML != null) { //<=
           var params = loader.doXPath("//param"); 
          document.getElementById("title").innerHTML = params[0].firstChild.nodeValue;
  } // <=
   else
        alert("Response contains no XML");
  }