function getHTTPObject()
{
   var http = false;

   if (window.XMLHttpRequest) { // Mozilla, Safari,...
       http = new XMLHttpRequest();
       if (http.overrideMimeType) {
           http.overrideMimeType('text/html');
       }
   } else if (window.ActiveXObject) { // IE
       try {
           http = new ActiveXObject("Msxml2.XMLHTTP");
       } catch (e) {
           try {
               http = new ActiveXObject("Microsoft.XMLHTTP");
           } catch (e) {}
       }
   } 
	return http; 
} 
var base_url = "http://www.alpenacvb.com/";
var base_photo_cat = "http://www.alpenacvb.com/photo-gallery-53/";
function update( id )
{
	dhtmlHistory.add("photoId", id);
	var http = getHTTPObject(); // We create the HTTP Object
	var url = "ajax-photo-get.js";
	http.open("GET",base_url + id + url,true);
	http.onreadystatechange = function()
	{
		if(http.readyState == 4)
		{
			var results = http.responseText.split("|");
			document.getElementById('photo-description').innerHTML = results[0];
			document.getElementById('photo-title').innerHTML = results[1];
			document.getElementById('main-photo').src = results[2];
			document.getElementById('sendPhoto').style.display = '';
		}
	}
	http.send(null);
}
function reset_gallery( photo_id )
{
	dhtmlHistory.remove("mainPhotoGroup");
	dhtmlHistory.add("mainPhotoGroup", photo_id);
	var http = getHTTPObject(); // We create the HTTP Object
	var url = "ajax-photo-category.js";
	http.open("GET",base_url + photo_id + url,true);
	http.onreadystatechange = function()
	{
		if(http.readyState == 4)
		{
			var results = http.responseText.split("|");
			document.getElementById('photo-description').innerHTML = '<div><p>How to use the gallery blah blah blah!</p></div>';
			document.getElementById('photo-title').innerHTML = 'Photo Gallery';
			document.getElementById('main-photo').src = base_url + 'assets/photo-default.jpg';
			document.getElementById('sendPhoto').style.display = 'none';
			document.getElementById('photo-gallery-thumbnails').innerHTML = results[3];
		}
	}
	http.send(null);
}
function send_photo()
{
	var http = getHTTPObject(); // We create the HTTP Object
	var url = "ajax-postcard.js";
	var imageString = document.getElementById('main-photo').src;
	http.open("GET",base_url + url + '?image=' + imageString,true);
	http.onreadystatechange = function()
	{
		if(http.readyState == 4)
		{
			var results = http.responseText;
			document.getElementById('photo-gallery').innerHTML = results;
		}
	}
	http.send(null);
}
var chkDot = true;
var usEmail = true;
function validEmail(eAddr) 
{ 
   var lenSuffix = (usEmail) ? 4: 3;
   var goodAddr = false;
   var ndxAt = ndxDot = 0;
   ndxAt  = eAddr.indexOf("@");
   ndxDot = eAddr.indexOf(".");
   ndxDot2 = eAddr.lastIndexOf(".");

   if ( (ndxDot < 0) || (ndxAt < 0) )
      return(goodAddr);
   else if (chkDot  && (ndxDot < ndxAt) )
      return(goodAddr);
   else if ( (ndxDot2 - 3) <= ndxAt)
        return(goodAddr);
   else if ( eAddr.length < (ndxDot2 + lenSuffix) )
        return(goodAddr);
   else
      goodAddr = true;
   return (goodAddr);                       
}
function goBack()
{
	var pForm = document.getElementById('fPreview');
	var http = getHTTPObject(); // We create the HTTP Object
	var url = "ajax-postcard.js";
	var url_query = '?image=' + pForm.image.value;
	url_query += '&s_email=' + pForm.s_email.value;
	url_query += '&r_email=' + pForm.r_email.value;
	url_query += '&s_name=' + pForm.s_name.value;
	url_query += '&r_name=' + pForm.r_name.value;
	url_query += '&subject=' + pForm.subject.value;
	url_query += '&message=' + pForm.message.value;
	url_query += '&rmethod=' + pForm.rmethod.value;
	http.open("GET",base_url + url + url_query,true);
	http.onreadystatechange = function()
	{
		if(http.readyState == 4)
		{
			var results = http.responseText;
			document.getElementById('photo-gallery').innerHTML = results;
		}
	}
	http.send(null);
}
function sendPostcard()
{
	var pForm = document.getElementById('fSend');
	var http = getHTTPObject(); // We create the HTTP Object
	var url = "ajax-send-postcard.js";
	var url_query = '?image=' + pForm.image.value;
	url_query += '&s_email=' + pForm.s_email.value;
	url_query += '&r_email=' + pForm.r_email.value;
	url_query += '&s_name=' + pForm.s_name.value;
	url_query += '&r_name=' + pForm.r_name.value;
	url_query += '&subject=' + pForm.subject.value;
	url_query += '&message=' + pForm.message.value;
	url_query += '&rmethod=' + pForm.rmethod.value;
	http.open("GET",base_url + url + url_query,true);
	http.onreadystatechange = function()
	{
		if(http.readyState == 4)
		{
			var results = http.responseText;
			document.getElementById('photo-gallery').innerHTML = results;
		}
	}
	http.send(null);
}
function preview()
{
	var pForm = document.getElementById('postcard');
	var mess = '';
	// check to see if the email addresses are filled in and correct format
	if( pForm.s_email.value == '' )
	{
		mess += 'Senders Email address is empty!\n';
	}
	else if( !validEmail(pForm.s_email.value) )
	{
		mess += 'Senders Email address is not in email format!\n';
	}
	if( pForm.r_email.value == '' )
	{
		mess += 'Recipient Email address is empty!\n';
	}
	else if( !validEmail(pForm.r_email.value) )
	{
		mess += 'Recipient Email address is not in email format!\n';
	}
	if( mess )
	{
		alert('Form not Submitted for following reasons:\n' + mess);
		return( false );
	}
	var http = getHTTPObject(); // We create the HTTP Object
	var url = "ajax-preview.js";
	var url_query = '?image=' + pForm.image.value;
	dhtmlHistory.add("preview", pForm.image.value);
	url_query += '&s_email=' + pForm.s_email.value;
	url_query += '&r_email=' + pForm.r_email.value;
	url_query += '&s_name=' + pForm.s_name.value;
	url_query += '&r_name=' + pForm.r_name.value;
	url_query += '&subject=' + pForm.subject.value;
	url_query += '&message=' + pForm.message.value;
	if( pForm.rmethod[0].checked == true )
	{
		url_query += '&rmethod=' + pForm.rmethod[0].value;
	}
	else if ( pForm.rmethod[1].checked == true )
	{
		url_query += '&rmethod=' + pForm.rmethod[1].value;
	}
	http.open("GET",base_url + url + url_query,true);
	http.onreadystatechange = function()
	{
		if(http.readyState == 4)
		{
			var results = http.responseText;
			document.getElementById('photo-gallery').innerHTML = results;
		}
	}
	http.send(null);
}
function addLoadListener(fn)
{
	if (typeof window.addEventListener != 'undefined')
	{
		window.addEventListener('load', fn, false);
	}
	else if (typeof document.addEventListener != 'undefined')
	{
		document.addEventListener('load', fn, false);
	}
	else if (typeof window.attachEvent != 'undefined')
	{
		window.attachEvent('onload', fn);
	}
	else
	{
		var oldfn = window.onload;
		if (typeof window.onload != 'function')
		{
			window.onload = fn;
		}
		else
		{
			window.onload = function()
			{
				oldfn();
				fn();
			};
		}
	}
}
function initialize() {
	// initialize our DHTML history
	dhtmlHistory.initialize();
	// subscribe to DHTML history change
	// events
	dhtmlHistory.addListener( historyChange);

	// if this is the first time we have
	// loaded the page...
	if (dhtmlHistory.isFirstLoad()) {
		// start adding history
		dhtmlHistory.add("mainPhotoGroup", "1");
	}
}

/** Our callback to receive history change events. */
function historyChange(newLocation, historyData) {
	var historyMsg = historyData;
	if( newLocation == "mainPhotoGroup" || newLocation == '' )
	{
		document.location.href = base_photo_cat;
	}
	if( newLocation == "photoId" )
	{
		goBack();
	}

	//debugMsg( "<b>A history change has " + "occured:</b> " + "newLocation="+newLocation + ", historyData="+historyMsg);
}

function debugMsg(msg) {
	var debugMsg = document.getElementById("debugMsg");
	debugMsg.innerHTML = msg;
}
addLoadListener(initialize)