var chartxmlhttp;

function getChart()
{   
chartxmlhttp=GetKissXmlHttpObject();
if (chartxmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="charts.php";
url=url+"?sid="+Math.random();
chartxmlhttp.onreadystatechange=chartstateChanged;
chartxmlhttp.open("POST",url,true);
chartxmlhttp.send(null);
}

function chartstateChanged()
{
if (chartxmlhttp.readyState==4)
{
    document.getElementById("chart").innerHTML=chartxmlhttp.responseText;
}
}

function GetChartXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}