var lightBox = Class.create({
	
	initialize: function() {

      this.lightboxType = 0;
	  this.lightboxCurrentContentID = 0;
	  
	  var lightboxText = '<div id="overlay" style="display:none"></div>'
					  + '<div id="box" style="display:none">'
					//  + '<img id="close" src="../image/closelabel.gif" onClick="box.hideBox()" alt="Close" title="Close this window" />'
					//  + '<div id="boxContents"></div>'
					  + '</div>';
					 
	  var body = document.getElementsByTagName("body")[0]; 
	  body.insert(lightboxText);

    },

    showLinkiBox : function(imgName){
		this.lightboxType = 'image';
		var contents = $('boxContents');
		
		var objImage = document.createElement("img");
		
		objImage.setAttribute('id','lightboxImage');
		contents.appendChild(objImage);
		imgPreload = new Image();
		imgPreload.onload=function(){
			objImage.src = '../image/boxBild.gif';
			this.showBox();
		}.bind(this);
		imgPreload.src = '../image/boxBild.gif';
		
		var insertion = '<p>Das hier ist der Text, der zu diesem Bild da oben gehört. Er ist etwa so lang.</p>'
		               +'<img src="../image/boxSmall.gif" />a'
		               +'<img src="../image/boxSmall.gif" />a'
		               +'<img src="../image/boxSmall.gif" />a';
		
		contents.insert(insertion, 'bottom');
		return false;
	},
	
	showBoxString : function(content, boxWidth, boxHeight){
		this.setLightboxDimensions(boxWidth, boxHeight);
		this.lightboxType = 'string';
		var contents = $('boxContents');
		contents.innerHTML = content;
		this.showBox();
		return false;
	},


	showBoxImage : function(href) {
		this.lightboxType = 'image';
		var contents = $('boxContents');
		var objImage = document.createElement("img");
		objImage.setAttribute('id','lightboxImage');
		contents.appendChild(objImage);
		imgPreload = new Image();
		imgPreload.onload=function(){
			objImage.src = href;
			this.showBox();
		}.bind(this);
		imgPreload.src = href;
		return false;
	},

	showBoxByID : function(id, boxWidth, boxHeight) {
		this.lightboxType = 'id';
		this.lightboxCurrentContentID = id;
		//this.setLightboxDimensions(555, 500);
		var element = $(id);
		var contents = $('box');
		contents.appendChild(element);
		Element.show(id);
		this.showBox();
		return false;
	},

	showBoxByAJAX : function(href, boxWidth, boxHeight) {
		this.lightboxType = 'ajax';
		this.setLightboxDimensions(boxWidth, boxHeight);
		var contents = $('boxContents');
		var myAjax = new Ajax.Updater(contents, href, {method: 'get'});
		this.showBox();
		return false;
	},
	
	setLightboxDimensions : function(width, height) {
		var windowSize = this.getPageDimensions();
		if(width) {
			if(width < windowSize[0]) {
				$('box').style.width = width + 'px';
			} else {
				$('box').style.width = (windowSize[0] - 50) + 'px';
			}
		}
		if(height) {
			if(height < windowSize[1]) {
				$('box').style.height = height + 'px';
			} else {
				$('box').style.height = (windowSize[1] - 50) + 'px';
			}
		}
	},


	showBox : function() {
		$('overlay').setOpacity(0.85);
		$('overlay').show();
		this.center('box');
		return false;
	},
	
	
	hideBox : function(){
		var contents = $('boxContents');
		if(this.lightboxType == 'id') {
			var body = document.getElementsByTagName("body").item(0);
			Element.hide(this.lightboxCurrentContentID);
			body.appendChild($(this.lightboxCurrentContentID));
		}
		contents.innerHTML = '';
		$('box').style.width = null;
		$('box').style.height = null;
		Element.hide('box');
		Element.hide('overlay');
		return false;
	},
	
	// taken from lightbox js, modified argument return order
	getPageDimensions : function(){
		var xScroll, yScroll;
	
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = document.body.scrollWidth;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		if (self.innerHeight) {	// all except Explorer
			windowWidth = self.innerWidth;
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
	
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = windowWidth;
		} else {
			pageWidth = xScroll;
		}
		arrayPageSize = new Array(windowWidth,windowHeight,pageWidth,pageHeight) 
		return arrayPageSize;
	},
	
	center : function(element){
		try{
			element = document.getElementById(element);
		}catch(e){
			return;
		}
		var windowSize = this.getPageDimensions();
		var window_width  = windowSize[0];
		var window_height = windowSize[1];
		
		$('overlay').style.height = windowSize[3] + 'px';
		
		element.style.position = 'absolute';
		element.style.zIndex   = 99;
	
		var scrollY = 0;
	
		if ( document.documentElement && document.documentElement.scrollTop ){
			scrollY = document.documentElement.scrollTop;
		}else if ( document.body && document.body.scrollTop ){
			scrollY = document.body.scrollTop;
		}else if ( window.pageYOffset ){
			scrollY = window.pageYOffset;
		}else if ( window.scrollY ){
			scrollY = window.scrollY;
		}
	
		var elementDimensions = Element.getDimensions(element);
		var setX = ( window_width  - elementDimensions.width  ) / 2;
		var setY = ( window_height - elementDimensions.height ) / 2 + scrollY;
	
		setX = ( setX < 0 ) ? 0 : setX;
		setY = ( setY < 0 ) ? 0 : setY;
	
		element.style.left = setX + "px";
		element.style.top  = setY + "px";
		Element.show(element);
	}
});



var box = 0;
function init(){
  box = new lightBox();
}