function openPopupWindow(url, win_name, w, h, scrollbars)
{
	var w = window.open(url, win_name, 'width='+w+',height='+h+',left='+((screen.availWidth-w)/2)+',top='+((screen.availHeight-h)/2)+',menubar=no,resizable=no,scrollbars='+scrollbars+',status=no,toolbar=no');
}

function openFBShare(url)
{
	var share_url = "http://www.facebook.com/sharer.php?u=" + url;
	openPopupWindow(share_url,'facebook_share', 600, 350, 0);
}

function toggle(obj)
{
	var el = document.getElementById(obj);
	el.style.display = (el.style.display != 'none' ? 'none' : '' );
}

function show(obj)
{
	var el = document.getElementById(obj);
	el.style.display = '';
}

function hide(obj)
{
	var el = document.getElementById(obj);
	el.style.display = 'none';
}

function showNewsletterForm()
{
	toggle('newsletter_submit_button');
	toggle('newsletter_spinner');
	toggle('nwlt_form');	
	hide('nwlt_success');
}

/**********************************************************************
*	AJAX
*********************************************************************/
var http_request = false;

function makePOSTRequest(url, parameters, callback)
{
	http_request = false;
	
	if (window.XMLHttpRequest)
	{ 
		// Mozilla, Safari,...
		http_request = new XMLHttpRequest();
	
		if (http_request.overrideMimeType)
		{
			// set type accordingly to anticipated content type
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
		}
	}
	else if (window.ActiveXObject)
	{ 
		// IE
		try
		{
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try
			{
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e)
			{
				// ....
			}
		}
	}
	
	if (!http_request)
	{
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	
	http_request.onreadystatechange = callback;
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parameters.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parameters);
}



/**********************************************************************
*	SUBSCRIBE
*********************************************************************/

function subscribeReadyStateChange()
{
	if (http_request.readyState == 4)
	{
		console.log(http_request.status);
		
		if (http_request.status == 200)
		{
			//alert(http_request.responseText);
			result = http_request.responseText;
			
			if(result == "SUCCESS")
			{
				document.getElementById("newsletter_input").value = "";
				show('nwlt_success');
				toggle('nwlt_form');
			}
			else
			{
				switch(result)
				{
					case "INVALID_EMAIL" :
						show('nwlt_invalid_email');
						break;
					
					case "EMAIL_ALREADY_EXISTS" :
						show('nwlt_email_exists');
						break;
					
					case "MAIL_SEND_ERROR" :
						show('nwlt_mail_send_error');
						break;				
				}
				
				toggle('newsletter_submit_button');
				toggle('newsletter_spinner');
			}
		}
		else
		{
			alert('There was a problem with the request.');
		}
	}
}

function submitNewsletterForm()
{
	hide('nwlt_invalid_email');
	hide('nwlt_email_exists');
	hide('nwlt_mail_send_error');
	
	toggle('newsletter_submit_button');
	toggle('newsletter_spinner');
	
	
	var poststr = "p=" + encodeURI(document.getElementById("newsletter_input").value);
	makePOSTRequest('/site/_ajax.subscribe.php', poststr, subscribeReadyStateChange);
	
}



/**********************************************************************
*	UNSUBSCRIBE
*********************************************************************/

function unsubscribeReadyStateChange()
{
	if (http_request.readyState == 4)
	{
		console.log(http_request.status);
		
		if (http_request.status == 200)
		{
			//alert(http_request.responseText);
			result = http_request.responseText;
			
			if(result == "SUCCESS")
			{
				document.getElementById("newsletter_unsubscribe_input").value = "";
				show('nwlt_unsubscribe_success');				
				show('newsletter_unsubscribe_submit_button');
				hide('newsletter_unsubscribe_spinner');
			}
			else
			{
				switch(result)
				{
					case "INVALID_EMAIL" :
						show('nwlt_unsubscribe_invalid_email');
						break;
					
					case "EMAIL_DOES_NOT_EXISTS" :
						show('nwlt_unsubscribe_email_exists');
						break;
					
					case "DB_ERROR" :
						show('nwlt_unsubscribe_db_error');
						break;				
				}
				
				toggle('newsletter_unsubscribe_submit_button');
				toggle('newsletter_unsubscribe_spinner');
			}
		}
		else
		{
			alert('There was a problem with the request.');
		}
	}
}

function unsubscribeNewsletter()
{
	hide('nwlt_unsubscribe_invalid_email');
	hide('nwlt_unsubscribe_email_exists');
	hide('nwlt_unsubscribe_db_error');
	
	toggle('newsletter_unsubscribe_submit_button');
	toggle('newsletter_unsubscribe_spinner');
	
	
	var poststr = "p=" + encodeURI(document.getElementById("newsletter_unsubscribe_input").value);
	makePOSTRequest('/site/_ajax.unsubscribe.php', poststr, unsubscribeReadyStateChange);
	
}