var xmlHttp

function stelcalc(t,h,p,d,w)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="stelcalc.php";

url=url+"?t="+escape(t);
url=url+"&h="+escape(h);
url=url+"&p="+escape(p);
url=url+"&d="+escape(d);
url=url+"&w="+escape(w);


xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function stateChanged() 
{ 
  document.getElementById("price").innerHTML='просчет...';

if (xmlHttp.readyState==4)
{ 
document.getElementById("price").innerHTML=xmlHttp.responseText;


}
}

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;
}