// holds an instance of XMLHttpRequest
var to_div = "";	
var datum = false;
var val;
var close=1;	
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.7.0",
                                    "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;
}


// called to read a file from the server
function process(require_page)
{
  // only continue if xmlHttp isn't void
  //alert('a'+obj);

  if (xmlHttp)
  {
    // try to connect to the server
    try
    {
      // initiate reading the async.txt file from the server
      require_page = encodeURI(require_page);	
      xmlHttp.open("GET", require_page, true);
      xmlHttp.onreadystatechange = handleRequestStateChange;
      xmlHttp.send(null);
    }
    // display the error in case of failure
    catch (e)
 
    {
      alert("Can't connect to server:\n" + e.toString());
    }
  }
}



// function that handles the HTTP response
function handleRequestStateChange() 
{
  // obtain a reference to the <div> element on the page
  myDiv = document.getElementById('test');
  // display the status of the request 
  if (xmlHttp.readyState == 1)
  {
    //myDiv.innerHTML = "loading... <br/>";
  }
  /*else if (xmlHttp.readyState == 2)
  {
    calendar.innerHTML += "Request status: 2 (loaded) <br/>";
  }
  else if (xmlHttp.readyState == 3)
  {
    calendar.innerHTML += "Request status: 3 (interactive) <br/>";
  }*/
  // when readyState is 4, we also read the server response
  else if (xmlHttp.readyState == 4) 
  {
    // continue only if HTTP status is "OK"
    if (xmlHttp.status == 200) 
    {
      try
      {
        close=true;
		// read the message from the server
        response = xmlHttp.responseText;
        // display the message 
        /*calendar.innerHTML += 
      
                      "Request status: 4 (complete). Server said: <br/>";*/
      //alert(response);                
			myDiv.innerHTML='';
			formik = document.getElementById('formik1');
			formik.pozice.value = response;
			var pole = response.split(',');
			if(pole[2]==0 && pole[3]==0 && (!document.getElementById('pozice_v').value))
			{
			   alert('Zadaná adresa nebyla nalezena, prosím vyberte umístění vašeho AP myší!');
			   myDiv = document.getElementById('map_canvas');
			   myDiv.style.display = '';
			   add_to_map(50.10648772767332, 14.39208984375, 0);
         //map.addOverlay(marker);
			   //myDiv.style.display='';
			}
			else
      { 
  			if (!document.getElementById('formik1').pozice_v.value)
          alert('Prosím zkontrulujte zprávnost umístění vašeho AP, případné korekce proveďte pomocí myši!');
        myDiv = document.getElementById('map_canvas');
        myDiv.style.display = '';
        dec2deg(pole[2], 'v'); 
        dec2deg(pole[3], 's');
        add_to_map(pole[2], pole[3], 9);
        //myDiv = document.getElementById('map_canvas');
        //myDiv.style.display='';
        
      }
			//formik.submit();
      }
      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);
    }
  }
}