var xmlhttp
function drop_down()
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }
var url="http://olupi.me/urejanje/get_drop_down.php";

//url=url+"&sid="+Math.random();
url=encodeURI(url);
//alert(url);

	xmlhttp.onreadystatechange=stateChanged;

xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{
		document.getElementById("drop_down").innerHTML=xmlhttp.responseText;
}
function GetXmlHttpObject()
{
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;
}