/**************************************************************

Script		: Overlay
Version		: 1.2
Authors		: Samuel birch
Desc		: Covers the window with a semi-transparent layer.
Licence		: Open Source MIT Licence

**************************************************************/

var Overlay = new Class({

    getOptions: function() {
        return {
            colour: '#000',
            opacity: 0.7,
            zIndex: 1,
            container: document.body,
            onClick: Class.empty
        };
    },

    initialize: function(options) {
        this.setOptions(this.getOptions(), options);

        this.options.container = $(this.options.container);

        this.container = new Element('div').setProperty('id', 'OverlayContainer').setStyles({
            position: 'absolute',
            left: '0px',
            top: '0px',
            width: '99%',
            zIndex: this.options.zIndex
        }).injectInside(this.options.container);

        this.iframe = new Element('iframe').setProperties({
            'id': 'OverlayIframe',
            'name': 'OverlayIframe',
            'src': 'javascript:void(0);',
            'frameborder': 1,
            'scrolling': 'no'
        }).setStyles({
            'position': 'absolute',
            'top': 0,
            'left': 0,
            'width': '100%',
            'height': '99%',
            'filter': 'progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)',
            'opacity': 0,
            'zIndex': 1
        }).injectInside(this.container);

        this.overlay = new Element('div').setProperty('id', 'Overlay').setStyles({
            position: 'absolute',
            left: '0px',
            top: '0px',
            width: '100%',
            height: '100%',
            zIndex: 2,
            backgroundColor: this.options.colour
        }).injectInside(this.container);

        this.container.addEvent('click', function() {
            this.options.onClick();
        } .bind(this));

        this.fade = new Fx.Style(this.container, 'opacity').set(0);
        this.position();

        window.addEvent('resize', this.position.bind(this));
    },

    position: function() {
        if (this.options.container == document.body) {
            var h = window.getScrollHeight() + 'px';
            this.container.setStyles({ top: '0px', height: h });
        } else {
            var myCoords = this.options.container.getCoordinates();
            this.container.setStyles({
                top: myCoords.top + 'px',
                height: myCoords.height + 'px',
                left: myCoords.left + 'px',
                width: myCoords.width + 'px'
            });
        }
    },

    show: function() {
        this.fade.start(0, this.options.opacity);
    },

    hide: function() {
        this.fade.start(this.options.opacity, 0);
    }

});
Overlay.implement(new Options);

/*************************************************************/