/*
Created By: Chris Campbell
Website: http://particletree.com
Date: 2/1/2006

Adapted By: Simon de Haan
Website: http://blog.eight.nl
Date: 21/2/2006

Inspired by the lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
And the lightbox gone wild by ParticleTree at http://particletree.com/features/lightbox-gone-wild/

*/

// ---------------------------------------------------
function showFlash(){
  var flashObjects = document.getElementsByTagName("object");
  for (i = 0; i < flashObjects.length; i++) {
    flashObjects[i].style.visibility = "visible";
  }
  var flashEmbeds = document.getElementsByTagName("embed");
  for (i = 0; i < flashEmbeds.length; i++) {
    flashEmbeds[i].style.visibility = "visible";
  }
}
// ---------------------------------------------------
function hideFlash(){         
    var flashObjects = document.getElementsByTagName("object");
    for (i = 0; i < flashObjects.length; i++) {
      flashObjects[i].style.visibility = "hidden";
    }
    var flashEmbeds = document.getElementsByTagName("embed");
    for (i = 0; i < flashEmbeds.length; i++) {
      if (flashEmbeds[i].id != 'sotester_l') {
        flashEmbeds[i].style.visibility = "hidden";
      }
    }                          
  }
// ---------------------------------------------------

/*-------------------------------GLOBAL VARIABLES------------------------------------*/
var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;
/*-----------------------------------------------------------------------------------------------*/
//Browser detect script origionally created by Peter Paul Koch at http://www.quirksmode.org/
function getBrowserInfo() {
	if (checkIt('konqueror')) {
		browser = "Konqueror";
		OS = "Linux";
	}
	else if (checkIt('safari')) browser 	= "Safari"
	else if (checkIt('omniweb')) browser 	= "OmniWeb"
	else if (checkIt('opera')) browser 		= "Opera"
	else if (checkIt('webtv')) browser 		= "WebTV";
	else if (checkIt('icab')) browser 		= "iCab"
	else if (checkIt('msie')) browser 		= "Internet Explorer"
	else if (!checkIt('compatible')) {
		browser = "Netscape Navigator"
		version = detect.charAt(8);
	}
	else browser = "An unknown browser";
	if (!version) version = detect.charAt(place + thestring.length);
	if (!OS) {
		if (checkIt('linux')) OS 		= "Linux";
		else if (checkIt('x11')) OS 	= "Unix";
		else if (checkIt('mac')) OS 	= "Mac"
		else if (checkIt('win')) OS 	= "Windows"
		else OS 								= "an unknown operating system";
	}
}
function checkIt(string) {
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}
/*-----------------------------------------------------------------------------------------------*/
Event.observe(window, 'load', initialize, false);
Event.observe(window, 'load', getBrowserInfo, false);
Event.observe(window, 'unload', Event.unloadCache, false);
var lightbox = Class.create();
lightbox.prototype = {
	yPos : 0,
	xPos : 0,
	initialize: function(ctrl) {     
		this.content = ctrl.rel;
		Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
		ctrl.onclick = function(){return false;};
	},
	// Turn everything on - mainly the IE fixes
	activate: function(){    
		if (browser == 'Internet Explorer'){
			this.getScroll();
			this.prepareIE('100%', 'hidden');
			this.setScroll(0,0);
			this.hideSelects('hidden');
		}
		this.displayLightbox("block");
	},
	// Ie requires height to 100% and overflow hidden or else you can scroll down past the lightbox
	prepareIE: function(height, overflow){
		bod = document.getElementsByTagName('body')[0];
		bod.style.height = height;
		bod.style.overflow = overflow;
		htm = document.getElementsByTagName('html')[0];
		htm.style.height = height;
		htm.style.overflow = overflow; 
	},
	// In IE, select elements hover on top of the lightbox
	hideSelects: function(visibility){
		selects = document.getElementsByTagName('select');
		for(i = 0; i < selects.length; i++) {
			selects[i].style.visibility = visibility;
		}
	},
	// Taken from lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
	getScroll: function(){
		if (self.pageYOffset) {
			this.yPos = self.pageYOffset;
		} else if (document.documentElement && document.documentElement.scrollTop){
			this.yPos = document.documentElement.scrollTop; 
		} else if (document.body) {
			this.yPos = document.body.scrollTop;
		}
	},
	setScroll: function(x, y){
		window.scrollTo(x, y); 
	},
	displayLightbox: function(display){
		$('overlay').style.display = display;
		$(this.content).style.display = display;
		if(display != 'none') this.actions();		
	},
	// Search through new links within the lightbox, and attach click event
	actions: function(){
		lbActions = document.getElementsByClassName('lbAction');
		for(i = 0; i < lbActions.length; i++) {
			Event.observe(lbActions[i], 'click', this[lbActions[i].rel].bindAsEventListener(this), false);
			lbActions[i].onclick = function(){return false;};
		}
	},
	
	// Example of creating your own functionality once lightbox is initiated
	deactivate: function(){   
		if (browser == "Internet Explorer"){
			this.setScroll(0,this.yPos);
			this.prepareIE("auto", "auto");
			this.hideSelects("visible");
		}
		this.displayLightbox("none");
    showFlash();
	}
}

/*-----------------------------------------------------------------------------------------------*/

// Onload, make all links that need to trigger a lightbox active
function initialize(){          
	addLightboxMarkup();
	lbox = document.getElementsByClassName('lbOn');
	for(i = 0; i < lbox.length; i++) {
		valid = new lightbox(lbox[i]);
	}
}

// Add in markup necessary to make this work. Basically two divs:
// Overlay holds the shadow
// Lightbox is the centered square that the content is put into.
function addLightboxMarkup() {
	bod 				= document.getElementsByTagName('body')[0];
	overlay 			= document.createElement('div');
	overlay.id			= 'overlay';
	bod.appendChild(overlay);
}



function _(title) {
  return document.getElementById(title);
}

function showImagesControls(photo_nr) {
  var images_count = _('images_count').value;
  
  if (photo_nr == 1) {
    _('previous_img').src = 'images/ankstesnis1.gif'; 
  } else {
    _('previous_img').src = 'images/kitas1.gif';
  } 
  
  if (photo_nr == images_count) {
    _('next_img').src = 'images/ankstesnis2.gif'; 
  } else {
    _('next_img').src = 'images/kitas2.gif';
  }
}

function showPrevious() {
  if (_('current_img').value > 1) {
    setImage(parseInt(_('current_img').value) - 1);
  }
}

function showNext() {
  var images_count = _('images_count').value; 
  
  if (parseInt(_('current_img').value) < images_count) {
    setImage(parseInt(_('current_img').value) + 1);
  }
}

function showLightbox(photo_nr) {    
  hideFlash();
  _('lightbox1').style.display='block';

  setImage(photo_nr);
  
  _('lightbox1').style.top = '0px';
  _('lightbox1').style.left = ((screen.width - 1000) / 2 - 10) + 'px';
  
  scroll(0, 0); 
}

function setImage(photo_nr) {      
  var photo_title = 'photo_titles_' + photo_nr;
  var photo_description = 'photo_descriptions_' + photo_nr;
  var photo_author = 'photo_authors_' + photo_nr;   
  var big_photo_title = 'big_photo_' + photo_nr;      
  _('big_photo').src = _('img_url').value + _(big_photo_title).value;
	_('photo_title').value = _(photo_title).value;
  _('photo_description').innerHTML = _(photo_description).value;
  _('photo_author').innerHTML = _(photo_author).value;

  showImagesControls(photo_nr);
  _('current_img').value = photo_nr;  
  
  var ppp = _('photos_per_page').value;
  
  if (photo_nr <= ppp) {
    showPage(1);
  } else {
    var f_page = photo_nr / ppp;
    var page = Math.round(photo_nr / ppp);
    if (f_page > page) {
      page = page + 1;
    }
    showPage(page);
  }
}

function showPage(nr) {    
  var current_page = 'photos_page_' + _('current_page').value;
  var show_page = 'photos_page_' + nr;
  var current_page_href = 'page_href_' + _('current_page').value;
  var page_href = 'page_href_' + nr;
  
  _(current_page).style.display = 'none';
  _(show_page).style.display = '';
  
  _(current_page_href).className = 'puslapiavimas';
  _(page_href).className = 'puslapiavimas active';
  
  _('current_page').value = nr;
}