var http_req = false;

function POSTRequest(url, parameters) {

  http_req = false;

  if (window.XMLHttpRequest) { // Mozilla, Safari,...

	 http_req = new XMLHttpRequest();

	 if (http_req.overrideMimeType) {

		// set type accordingly to anticipated content type

		//http_req.overrideMimeType('text/xml');

		http_req.overrideMimeType('text/html');

	 }

  } else if (window.ActiveXObject) { // IE

	 try {

		http_req = new ActiveXObject("Msxml2.XMLHTTP");

	 } catch (e) {

		try {

		   http_req = new ActiveXObject("Microsoft.XMLHTTP");

		} catch (e) {}

	 }

  }

  if (!http_req) {

	 alert('Cannot create XMLHTTP instance');

	 return false;

  }

  //alert(parameters);

  http_req.onreadystatechange = Contents;

  http_req.open('POST', url, true);

  http_req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

  http_req.setRequestHeader("Content-length", parameters.length);

  http_req.setRequestHeader("Connection", "close");

  http_req.send(parameters);

}



function Contents()

{

  //alert(http_req.responseText);

  if (http_req.readyState == 4) 

  {

	 if (http_req.status == 200) 

	 {

		//alert(http_req.responseText);

		result = http_req.responseText;

		if(result == 'You forgot to select a value!' || result == 'You have already voted!')

		{

			document.getElementById('alertmessage').innerHTML = "<font style=\"font-size: 10px; color: #FF0000;\">"+result+"</font>";

		}

		else

			document.getElementById('poll_changed').innerHTML = result;

	 } 

	 else 

	 {

		alert('There was a problem with the request.');

	 }

  }

}



function getCheckedValue(radioObj) {

	if(!radioObj)

		return "";

	var radioLength = radioObj.length;

	if(radioLength == undefined)

		if(radioObj.checked)

			return radioObj.value;

		else

			return "";

	for(var i = 0; i < radioLength; i++) {

		if(radioObj[i].checked) {

			return radioObj[i].value;

		}

	}

	return "";

}



function _do_vote(obj) 

{

	var vote = getCheckedValue(document.forms['poll'].elements['vote']);

	var question_id = document.getElementById("question_id");



	//document.getElementById('alertmessage').innerHTML = "<font style=\"font-size: 10px; color: #FF0000;\">Sending...</font>"; 

	document.getElementById('alertmessage').innerHTML = '<img src="images/progress.gif" align="absmiddle" />';

	var str = "vote=" + encodeURI( vote ) + "&question_id=" + encodeURI( question_id.value );

	POSTRequest('poll_vote.php', str);

}



function _view_poll(obj) 

{

	var question_id = document.getElementById("question_id");

	//document.getElementById('alertmessage').innerHTML = "<font style=\"font-size: 10px; color: #FF0000;\">Sending...</font>"; 

	document.getElementById('alertmessage').innerHTML = '<img src="images/progress.gif" align="absmiddle" />';

	var str = "question_id=" + encodeURI( question_id.value );

	POSTRequest('poll_view.php', str);

}



function _back_to_poll(obj) 

{

	//document.getElementById('alertmessage').innerHTML = "<font style=\"font-size: 10px; color: #FF0000;\">Sending...</font>"; 

	document.getElementById('alertmessage').innerHTML = '<img src="images/progress.gif" align="absmiddle" />';

	POSTRequest('poll_back_to_poll.php', '');

}