// 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
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
    // try every prog id until one works
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      { 
        // try to create XMLHttpRequest object
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {}
    }
  }
  // return the created object or display an error message
  if (!xmlHttp)
    alert("Error creating the XMLHttpRequest object.");
  else 
    return xmlHttp;
}

 
// read a file from the server
function changeProduct(productID, boxType, boxID, ajaxID)
{
  // only continue if xmlHttp isn't void
  if (xmlHttp && xmlHttp.readyState!=1 && xmlHttp.readyState !=2 && xmlHttp.readyState!=3)
  {
    // try to connect to the server
    try
    {
      // get the two values entered by the user
    
	
      switch (ajaxID)
	{

	      case 1: var date=new Date();
	      var timestamp=date.getTime();
	      // create the params string
	      var params = "product=" + productID + 
                   "&boxStyle=" + boxType +
		   "&boxNumber="+boxID +
                   "&ajaxID="+ajaxID +
		   "&date="+timestamp;
	      // initiate the asynchronous HTTP request
	      xmlHttp.open("GET", "http://www.catholicshirts.net/ajaxinterface.php?" + params, true);
	      xmlHttp.onreadystatechange = function () {handleRequestStateChange(boxID, ajaxID);};
	      xmlHttp.send(null);
      	      break;
	 }


    }	      
        // display the error in case of failure
    catch (e)
    {
      alert("Can't connect to server:\n"+xmlHttp.readyState + e.toString());
    }
  }
  else
  {
	alert ("Hold on a minute.  I'm not finished!"+xmlHttp.readyState);
  }
}

// function called when the state of the HTTP request changes
function handleRequestStateChange(boxID, ajaxID) 
{

	  switch (ajaxID)
          {

		case 1:
		  // when readyState is 4, we are ready to read the server response
		  if (xmlHttp.readyState == 4) 
  		  {
		  	 // continue only if HTTP status is "OK"
			    if (xmlHttp.status == 200) 
			    {
			      try
			      {
			        // do something with the response from the server

			        handleServerResponse(boxID, ajaxID);
			      }
			      catch(e)
			      {
			        // display error message
			        alert("Error reading the response: " + e.toString());
			      }
			    } 
			    else
			    {
			      // display status message
			      alert("There was a problem retrieving the data:\n" + 
			            xmlHttp.statusText);
			    }
		  }
			  else
			  {
				 myDiv = document.getElementById("myStyleBox"+boxID);
		 
				 myDiv.innerHTML = "<img src='http://www.catholicshirts.net/images/loading2.gif'>";
 
 			 }	  
	}
}
// handles the response received from the server
function handleServerResponse(boxID, ajaxID)
{


  // retrieve the server's response packaged as an XML DOM object
 // var xmlResponse = xmlHttp.responseXML;
  // catching potential errors with IE and Opera
/*
  if (!xmlResponse || !xmlResponse.documentElement)
    throw("Invalid XML structure 3:\n" + xmlHttp.responseText);
 
  // catching potential errors with Firefox
  var rootNodeName = xmlResponse.documentElement.nodeName;
  if (rootNodeName == "parsererror") 
    throw("Invalid XML structure 4:\n" + xmlHttp.responseText);
  // getting the root element (the document element)
  xmlRoot = xmlResponse.documentElement;
  // testing that we received the XML document we expect
  if (rootNodeName != "response" || !xmlRoot.firstChild)
    throw("Invalid XML structure 5:\n" + xmlHttp.responseText);
  // the value we need to display is the child of the root <response> element
  responseText = xmlRoot.firstChild.data;
 
  // display the user message


  //get the box number, which should be 10 through 99

*/
	  switch (ajaxID)
          {
		  case 1:

			  responseText2= xmlHttp.responseText;
			  myDiv = document.getElementById("myStyleBox"+boxID);
			  //alert ("the length of reponseText 1 is"+responseText.length);
			  //alert ("the length of reponseText 2 is"+responseText2.length);
			  myDiv.innerHTML = responseText2;
			  break;
  	 }

 

  
}