// stores the reference to the XMLHttpRequest object
var xmlHttp = createXmlHttpRequestObject(); 
old_elem = 0;

// retrieves the XMLHttpRequest object
function createXmlHttpRequestObject() 
{	
  // will store the reference to the XMLHttpRequest object
  var xmlHttp;
  // if running Internet Explorer
  if(window.ActiveXObject)
  {
    try
    {
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (e) 
    {
      xmlHttp = false;
    }
  }
  // if running Mozilla or other browsers
  else
  {
    try 
    {
      xmlHttp = new XMLHttpRequest();
    }
    catch (e) 
    {
      xmlHttp = false;
    }
  }
  // return the created object or display an error message
  if (!xmlHttp)
 
    alert("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}

// make asynchronous HTTP request using the XMLHttpRequest object 
function process(id, ccount)
{
  ccount = ccount || 1;//количество заказаных товаров

  document.getElementById("buy_tov").innerHTML = '<img src="/pw.gif">';
  // proceed only if the xmlHttp object isn't busy
  
  if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0)
  {
    // retrieve the name typed by the user on the form
    //name = encodeURIComponent(document.getElementById("myName").value);
    // execute the ajax.php page from the server

   
	xmlHttp.open("GET", "/shop.php?id=" + id + "&count=" + ccount + "&r="+Math.random(), true); 
	
    // define the method to handle server responses
    xmlHttp.onreadystatechange = handleServerResponse;
    // make the server request
    xmlHttp.send(null);
  }
}


// executed automatically when a message is received from the server
function handleServerResponse() 
{	
  // move forward only if the transaction has completed
  if (xmlHttp.readyState == 4) 
  {
    // status of 200 indicates the transaction completed successfully
    if (xmlHttp.status == 200) 
    {
	  // extract the XML retrieved from the server
      /*xmlResponse = xmlHttp.responseXML;
      // obtain the document element (the root element) of the XML structure
      xmlDocumentElement = xmlResponse.documentElement;
      // get the text message, which is in the first child of
      // the the document element
      helloMessage = xmlDocumentElement.firstChild.data;
	*/
	  helloMessage = xmlHttp.responseText;
      // update the client display using the data received from the server
      document.getElementById("basket").innerHTML = helloMessage;
	  document.getElementById("buy_tov").innerHTML = 'добавлено';
      // restart sequence
    }
    // a HTTP status different than 200 signals an error
    else 
    {
      alert("There was a problem accessing the server: " + xmlHttp.statusText);
    }
  }
}

function handleServerResponse2() 
{	
  // move forward only if the transaction has completed
  if (xmlHttp.readyState == 4) 
  {
    // status of 200 indicates the transaction completed successfully
    if (xmlHttp.status == 200) 
    {
	  // extract the XML retrieved from the server
      /*xmlResponse = xmlHttp.responseXML;
      // obtain the document element (the root element) of the XML structure
      xmlDocumentElement = xmlResponse.documentElement;
      // get the text message, which is in the first child of
      // the the document element
      helloMessage = xmlDocumentElement.firstChild.data;
	*/
	  helloMessage = xmlHttp.responseText;
      // update the client display using the data received from the server
      alert(helloMessage);
      // restart sequence
    }
    // a HTTP status different than 200 signals an error
    else 
    {
      alert("There was a problem accessing the server: " + xmlHttp.statusText);
    }
  }
}


function display(id, edizm) 
{
	var c = document.getElementById('cart_'+id);
	if(old_elem)
	{
		var old = document.getElementById('cart_'+old_elem);
		old.innerHTML = '';
	}
	old_elem = id;
	if (c.style.display != "block")
	{
		html = "<form onSubmit=\"process("+id+",document.forms['count_cart'].elements[0].value);return false;\" name='count_cart'><input type='text' style='width:27px;height:13px;font-size:10px;' name='ccount' value='1'> "+edizm+" <span id='cart' onClick=\"process("+id+",document.forms['count_cart'].elements[0].value)\"><span id='buy_tov'><img src=\"/apply.png\"></span></span></form>";

		c.innerHTML = html;
		c.style.display = "block";
	}
	else
	{
		c.style.display = "none";
	}
    return false;
}