/**
* Lightbox
*
* This libary is used to create a lightbox in a web application.  This library
* requires the Prototype 1.6 library and Script.aculo.us core, effects, and dragdrop
* libraries.  To use, add a div containing the content to be displayed anywhere on
* the page.  To create the lightbox, add the following code:
*
*	var test;
*
*	Event.observe(window, 'load', function () {
*		test = new Lightbox('idOfMyDiv');
*	});
*
*	Event.observe('lightboxLink', 'click', function () {
*		test.open();
*	});
*
*	Event.observe('closeLink', 'click', function () {
*		test.close();
*	});
*
*/

var Lightbox = Class.create({
	open : function () {
		this._centerWindow(this.container);
		this._fade('open', this.container);
	},

	close : function () {
		this._fade('close', this.container);
	},

	_fade : function fadeBg(userAction,whichDiv){
		if(userAction=='close'){
			new Effect.Opacity('bg_fade',
					   {duration:.5,
					    from:0.5,
					    to:0,
					    afterFinish:this._makeInvisible,
					    afterUpdate:this._hideLayer(whichDiv)});
		}else{
			new Effect.Opacity('bg_fade',
					   {duration:.5,
					    from:0,
					    to:0.5,
					    beforeUpdate:this._makeVisible,
					    afterFinish:this._showLayer(whichDiv)});
		}
	},

	_makeVisible : function makeVisible(){
                        var offset =  document.viewport.getScrollOffsets();
                        newHeight = document.viewport.getHeight()+offset['top'];

                        //alert("height="+document.viewport.getHeight()+"-"+newHeight);

                        $("bg_fade").style.height=newHeight+"px";

                        
                        /*
                        $("bg_fade").setStyle({
                            height: newHeight+'px'
                            }
                        );
                        */


                $('bg_fade').show();
		$("bg_fade").style.visibility="visible";
	},

	_makeInvisible : function makeInvisible(){
		$("bg_fade").style.visibility="hidden";
	},

	_showLayer : function showLayer(userAction){
		$(userAction).style.display="block";
	},

	_hideLayer : function hideLayer(userAction){
		$(userAction).style.display="none";
	},

	_centerWindow : function centerWindow(element) {
		var windowHeight = parseFloat($(element).getHeight())/2;
		var windowWidth = parseFloat($(element).getWidth())/2;
                var offset =  document.viewport.getScrollOffsets();

		if(typeof window.innerHeight != 'undefined') {
			$(element).style.top = Math.round(document.body.offsetTop + offset['top'] + ((window.innerHeight - $(element).getHeight()))/4)+'px';
			$(element).style.left = Math.round(document.body.offsetLeft + ((window.innerWidth - $(element).getWidth()))/2)+'px';
		} else {
			$(element).style.top =  Math.round(document.body.offsetTop + offset['top'] + ((document.documentElement.offsetHeight - $(element).getHeight()))/4)+'px';
			$(element).style.left = Math.round(document.body.offsetLeft + ((document.documentElement.offsetWidth - $(element).getWidth()))/2)+'px';
		}


	},

	initialize : function(containerDiv) {
		this.container = containerDiv;
		if($('bg_fade') == null) {
			var screen = new Element('div', {'id': 'bg_fade'});
			document.body.appendChild(screen);

                    // wielkosc okna

                        //alert(window.innerHeight+"="+newHeight)
                        $('bg_fade').hide();


                    // ---

		}
		new Draggable(this.container);
		this._hideLayer(this.container);
	}
});