/*--------------------------------------------------------------------------*/
/*	Lightbox	
*	This is a script for creating modal dialog windows (like the ones your operating
*	system uses)
*	
*/

var Lightbox = {
	/* hideAll - closes all open lightbox windows */
	hideAll: function(){
		lboxes = document.getElementsByClassName('lbox')
		lboxes.each(function(box){
				Element.hide(box)
			}
		)
		if ($('overlay')){
			Element.remove('overlay');
			}
	}
}
Lightbox.base = Class.create();
Lightbox.base.prototype = {

    initialize: function(element, options) {
        //start by hiding all lightboxes
        Lightbox.hideAll();

        this.element = $(element);
        this.options = Object.extend({
            lightboxClassName: 'lightbox',
            closeOnOverlayClick: false,
            externalControl: false
        }, options || {})

        //create the overlay
        new Insertion.Before(this.element, "<div id='overlay' style='display:none;'></div>");

        Element.addClassName(this.element, this.options.lightboxClassName)

        //also add a default lbox class to the lightbox div so we can find and close all lightboxes if we need to
        Element.addClassName(this.element, 'lbox')

        //Tip: make sure the path to the close.gif image below is correct for your setup
        closer = '<img id="close" src="img_site/close.gif" alt="Fechar" title="Fechar esta janela." />'

        //insert the closer image into the div
        new Insertion.Top(this.element, closer);

        Event.observe($('close'), 'click', this.hideBox.bindAsEventListener(this));

        if (this.options.closeOnOverlayClick) {
            Event.observe($('overlay'), 'click', this.hideBox.bindAsEventListener(this));
        }
        if (this.options.externalControl) {
            Event.observe($(this.options.externalControl), 'click', this.hideBox.bindAsEventListener(this));
        }

        this.showBox();
    },

    showBox: function() {
        //show the overlay
        Element.show('overlay');

        //center the lightbox
        this.center();

        //show the lightbox
        Element.show(this.element);
        return false;
    },

    hideBox: function(evt) {
        Element.removeClassName(this.element, this.options.lightboxClassName)
        Element.hide(this.element);
        //remove the overlay element from the DOM completely
        Element.remove('overlay');
        return false;
    },

    center: function() {
        var my_width = 0;
        var my_height = 0;

        if (typeof (window.innerWidth) == 'number') {
            my_width = window.innerWidth;
            my_height = window.innerHeight;
        } else if (document.documentElement &&
				 (document.documentElement.clientWidth ||
				   document.documentElement.clientHeight)) {
            my_width = document.documentElement.clientWidth;
            my_height = document.documentElement.clientHeight;
        }
        else if (document.body &&
				(document.body.clientWidth || document.body.clientHeight)) {
            my_width = document.body.clientWidth;
            my_height = document.body.clientHeight;
        }

        this.element.style.position = 'absolute';
        this.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(this.element);

        var setX = (my_width - elementDimensions.width) / 2;
        var setY = (my_height - elementDimensions.height) / 2 + scrollY;

        setX = (setX < 0) ? 0 : setX;
        setY = (setY < 0) ? 0 : setY;

        this.element.style.left = setX + "px";
        this.element.style.top = setY + "px";
       // window.scrollTo(0, setY);

    }


}