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

        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: '#ffffff',
                        opacity: 0.9,
                        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': '90%',
                        '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);

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