var exmlHttp

function showdates(strr)
{
	var sdate=eval(strr)+1;
	var urld="";
	urld+="dt="+sdate; 

exmlHttp=GetXmlHttpObject()

if (exmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var eurl="exam_dates.php";
eurl=eurl+"?"+urld;
eurl=eurl+"&sid="+Math.random();
exmlHttp.onreadystatechange=statesChangeds;
exmlHttp.open("GET",eurl,true);
exmlHttp.send(null);
} 

function statesChangeds() 
{ 
if (exmlHttp.readyState==4)
{ var res=exmlHttp.responseText;

var rst = res.split("&");
var cnt = rst[0];
var vdt = rst[1].split(",");
var tdt = rst[2].split(",");
var selopt = document.getElementById("exm_dates");
while(selopt.hasChildNodes()){
selopt.removeChild(selopt.childNodes[0])
}
for(i=0; i<=cnt; i++){
var newOption = document.createElement("option");
//selopt.appendChild(newOption);
selopt.options.add(newOption);
selopt.options[i].value = vdt[i];
selopt.options[i].text = tdt[i];
//var newOption = document.createElement('<option value='+vdt[i]+'>');
//document.mosForm.exm_dates.options.add(newOption);
//newOption.innerText = tdt[i];
}
}
}

function GetXmlHttpObject()
{
var exmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  exmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    exmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    exmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return exmlHttp;
}