Prototype.Browser.IE6 = Prototype.Browser.IE && parseInt(navigator.userAgent.substring(navigator.userAgent.indexOf("MSIE")+5)) == 6;
Prototype.Browser.IE7 = Prototype.Browser.IE && parseInt(navigator.userAgent.substring(navigator.userAgent.indexOf("MSIE")+5)) == 7;
Prototype.Browser.IE8 = Prototype.Browser.IE && !Prototype.Browser.IE6 && !Prototype.Browser.IE7;

var Accordion = Class.create({

    initialize: function(defaultExpandedCount) {
        this.accordion = $('accordeon');
        this.options = {
            toggleClass: "title",
            toggleActive: "current",
            contentClass: "accor"
        }
        this.contents = this.accordion.select('div.'+this.options.contentClass);
        this.isAnimating = false;
        this.maxHeight = 0;
        this.current = defaultExpandedCount ? this.contents[defaultExpandedCount-1] : this.contents[0];
        this.toExpand = null;

        this.checkMaxHeight();
        this.initialHide();
        this.attachInitialMaxHeight();

        var clickHandler =  this.clickHandler.bindAsEventListener(this);
        this.accordion.observe('click', clickHandler);
    },

    expand: function(el) {
        this.toExpand = el.next('div.'+this.options.contentClass);
        if(this.current != this.toExpand){
			this.toExpand.show();
            this.animate();
        }
    },

    checkMaxHeight: function() {
        for(var i=0; i<this.contents.length; i++) {
            if(this.contents[i].getHeight() > this.maxHeight) {
                this.maxHeight = this.contents[i].getHeight()+20;
            }
        }
    },

    attachInitialMaxHeight: function() {
		this.current.previous('div.'+this.options.toggleClass).firstDescendant().firstDescendant().addClassName(this.options.toggleActive);
        if(this.current.getHeight() != this.maxHeight) this.current.setStyle({height: this.maxHeight+"px"});
    },

    clickHandler: function(e) {
        var elarr = e.element().ancestors();
        var el = elarr[1];
        if(el.hasClassName(this.options.toggleClass) && !this.isAnimating) {
            this.expand(el);
        }
    },

    initialHide: function(){
        for(var i=0; i<this.contents.length; i++){
            if(this.contents[i] != this.current) {
                this.contents[i].hide();
                this.contents[i].setStyle({height: 0});
            }
        }
    },

    animate: function() {

        var effects = new Array();
        var options = {
            sync: true,
            scaleFrom: 0,
            scaleContent: false,
            transition: Effect.Transitions.sinoidal,
            scaleMode: {
                originalHeight: this.maxHeight,
                originalWidth: this.accordion.getWidth()
            },
            scaleX: false,
            scaleY: true
        };

        effects.push(new Effect.Scale(this.toExpand, 100, options));

        options = {
            sync: true,
            scaleContent: false,
            transition: Effect.Transitions.sinoidal,
            scaleX: false,
            scaleY: true
        };

        effects.push(new Effect.Scale(this.current, 0, options));

        var myDuration = 0.6;

        new Effect.Parallel(effects, {
            duration: myDuration,
            fps: 35,
            queue: {
                position: 'end',
                scope: 'accordion'
            },
            beforeStart: function() {
                this.isAnimating = true;
                this.current.previous('div.'+this.options.toggleClass).firstDescendant().firstDescendant().removeClassName(this.options.toggleActive);
                this.toExpand.previous('div.'+this.options.toggleClass).firstDescendant().firstDescendant().addClassName(this.options.toggleActive);
            }.bind(this),
            afterFinish: function() {
                this.current.hide();               
				if (Prototype.Browser.IE8)
				{
                	this.toExpand.previous('div.'+this.options.toggleClass).style.margintop = '5px';
                }
                this.toExpand.setStyle({ height: this.maxHeight+"px" });
                this.current = this.toExpand;
                this.isAnimating = false;
            }.bind(this)
        });
    }

});

document.observe("dom:loaded", function(){
	if ($('accordeon'))
	{
		accordion = new Accordion(1);
	}
})