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

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': '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);

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);

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