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

    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: '100%',
            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': '99%',
            '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);
        
        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);

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