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

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: 0.6,
            zIndex: 1,
            container: document.body,
            _onClick: $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: '100%',
            zIndex: this.options.zIndex
        }).injectInside(this.options.container);

        this.iframe = new Element('iframe').setProperties({
            'id': 'OverlayIframe',
            'name': 'OverlayIframe',
            'src': 'javascript:void(0);',
            'frameborder': 0,
            'scrolling': 'no'
        }).setStyles({
            'position': 'absolute',
            'top': 0,
            'left': 0,
            'width': '100%',
            'height': '100%',
            '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);

        if (this.options._onClick) {
            this.container.addEvent('click', function() {
                this.options._onClick.call(this)
            } .bind(this));
        }

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

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

    setOnClick: function(func) {
        this.container.addEvent('click', func);
    },

    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);
        this.container.fade(this.options.opacity);
    },

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

});
overlay.implement(new Options);

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