var xmlHttp

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

function playmedia(str)
{
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	  {
	  alert ("Your browser does not support AJAX!");
	  return;
	  }
	var url="media.php";
	url=url+"?file="+str;
	xmlHttp.onreadystatechange=statechangemedia;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function statechangemedia() 
{
if (xmlHttp.readyState==4)
{
document.getElementById("media").innerHTML=xmlHttp.responseText;
}
}