function loadXMLDoc(targetURL, querytype, fromDate, toDate)
{
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
    }   
  }

  if (querytype==1)
  { 
    xmlhttp.open("POST", targetURL, true);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
    xmlhttp.send("fromDate=" + fromDate + "&toDate=" + toDate + "&raceDist=ALL");  
  }
  else if (querytype==2)
  { 
    xmlhttp.open("POST", targetURL, true);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");   
    xmlhttp.send();
  }
  else if (querytype==3)
  { 
    xmlhttp.open("POST", targetURL, true);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");   
    xmlhttp.send();
  } 
  else if (querytype==4)
  {
    if (document.pb_form.racedist.value=="ALL")
    {
      xmlhttp.open("POST","results_queries/fullPBs.php",true);
      xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
      xmlhttp.send();
    } 
    else 
    {   
      xmlhttp.open("POST","results_queries/dbtest.php",true);
      xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
      xmlhttp.send("racedist=" + document.pb_form.racedist.value);
    }  
  }  
  else if (querytype==5)
  {
      xmlhttp.open("POST","results_queries/resultsByEvent.php",true);
      xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
      xmlhttp.send("fromDate=" + document.testform.date15_year.value + "/" + document.testform.date15_month.value + "/" + document.testform.date15_date.value + "&toDate=" + document.testform.date16_year.value + "/" + document.testform.date16_month.value + "/" + document.testform.date16_date.value + "raceDist=" + document.testform.r_racedist.value);   
  }
  
  
  
  
  
  
  
  
}