var xmlHttp
function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{
		str = xmlHttp.responseText;
		//output = str.split('*sib*');
		//document.getElementById('product_number').innerHTML = output[1];
		document.getElementById("calendar").innerHTML = str;
	} 
}

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 drawCalendar(prm, chm)
{
xmlHttp=GetXmlHttpObject();
if(xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request");
 return;
 }
 else
 {
var url="http://drdog.co.uk/drawcalendar.php";
url=url+"?prm="+prm+"&chm="+chm;
url=url+"&sid="+Math.random();
/*alert(url)*/;
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
 }
}