Jschart and Ajax

hello all, I created a file with an xml jschart, now I'm trying to modify the xml file via ajax when the user changes a select, this works perfectly but, how to refresh the jschart at that time?

Simply:

  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    myChart.setDataXML('displaybenchmark.xml');
    myChart.draw();
    }

Guillermo:

It's obviously a good while since you posted this, but could you elaborate a little more on how you used the xmlhttp.ReadyState in conjunction with the draw() function?

Thanks!