// holds an instance of XMLHttpRequest
var xmlHttp = createXmlHttpRequestObject();

// creates an XMLHttpRequest instance
function createXmlHttpRequestObject()
{
// will store the reference to the XMLHttpRequest object
var xmlHttp;
// this should work for all browsers except IE6 and older
try
{
// try to create XMLHttpRequest object
xmlHttp = new XMLHttpRequest();
}
catch(e)
{
// assume IE6 or older
try
{
xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
}
catch(e) { }
}
// return the created object or display an error message
if (!xmlHttp)
alert("Error creating the XMLHttpRequest object.");
else
return xmlHttp;
}
	// called to read a file from the server
	function processprice()
	{
		
		
	// only continue if xmlHttp isn't void
	if (xmlHttp)
	{
	// try to connect to the server
	try
	{
	
	var prodid = document.frmtype.product.value;
	
	xmlHttp.open("GET", "price_product.php?productid="+prodid, true);
	xmlHttp.onreadystatechange = handleRequestStateChangeprice;
	xmlHttp.send(null);
	}
	// display the error in case of failure
	catch (e)
	{
	alert("Server is not responding");
	}
	}
	}
	// function that handles the HTTP response
	function handleRequestStateChangeprice()
	{
	
	// obtain a reference to the <div> element on the page
	myDiv = document.getElementById("myDivElement");
	// display the status of the request
	if (xmlHttp.readyState == 1)
	{
		document.getElementById("div_loading").style.display = "block";
	}
	/*
	else if (xmlHttp.readyState == 2)
	{
	myDiv.innerHTML += "Request status: 2 (loaded) <br/>";
	}
	else if (xmlHttp.readyState == 3)
	{
	myDiv.innerHTML += "Request status: 3 (interactive) <br/>";
	}
	// when readyState is 4, we also read the server response
	else */
	else if (xmlHttp.readyState == 4)
	{
		
		// continue only if HTTP status is "OK"
		document.getElementById("div_loading").style.display = "none";
			if (xmlHttp.status == 200)
			{
					
				try
				{
				// read the message from the server
				response = xmlHttp.responseText;
				// display the message
				//myDiv.innerHTML += "Request status: 4 (complete). Server said: <br/>";
				myDiv.innerHTML = response;
				
					
					process1();
					
			
				}
				catch(e)
				{
				// display error message
					 if(document.getElementById("calculator").innerHTML)
					 {
						 document.getElementById("calculator").innerHTML = "";
						 document.getElementById("error").innerHTML = "Sorry details are not available";
					 }
					 else
					 {
						 document.getElementById("error").innerHTML = "Sorry details are not available";
					 }
				}
			}
			else
			{
				// display status message
			alert("There is a problem in retrieving the data:\n" +
			xmlHttp.statusText);
			}
	
		
	}
}