var xmlhttp;

function alterprice(str,cost)
{
	xmlhttp = GetXmlHttpObject();
	if (xmlhttp==null)
  	{
  		alert ("Browser does not support HTTP Request");
  		return;
  	}
	
	var url="/_scripts/ajaxhandler.script.php";
	url=url+"?payment-type="+str+"&cost="+cost;
	url=url+"&sid="+Math.random();
	xmlhttp.onreadystatechange=stateChanged;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
}

function stateChanged()
{
	if (xmlhttp.readyState==4)
	{
		document.getElementById("totalcost").innerHTML=xmlhttp.responseText;
	}
}

function GetXmlHttpObject()
{
	if (window.XMLHttpRequest)
	{
  		return new XMLHttpRequest();
  	}
	if (window.ActiveXObject)
	{
  		return new ActiveXObject("Microsoft.XMLHTTP");
  	}	
	
	return null;
}