var Dialog = {};
Dialog.Box = Class.create();
Object.extend(Dialog.Box.prototype, {
	initialize: function(id) 
	{
		this.createOverlay();
		this.dialog_box = $(id);
		this.dialog_box.show = this.show.bind(this);
		this.dialog_box.hide = this.hide.bind(this);
		this.parent_element = this.dialog_box.parentNode;
		var e_dims = Element.getDimensions(this.dialog_box);
		var b_dims = Element.getDimensions(this.overlay);
		this.dialog_box.style.position = "absolute";
		this.dialog_box.style.left = ((b_dims.width/2) - (e_dims.width/2)) + 'px';
		this.dialog_box.style.top = '54px';
		this.dialog_box.style.zIndex = parseInt(this.overlay.style.zIndex) + 1;
	},
	createOverlay: function() 
	{
		if($('dialog_overlay')) 
		{
			this.overlay = $('dialog_overlay');
		} 
		else 
		{
			this.overlay = document.createElement('div');
			this.overlay.id = 'dialog_overlay';
			Object.extend(this.overlay.style, 
			{
				position: 'absolute',
				top: 0,
				left: 0,
				zIndex: 90,
				width: '100%',
				backgroundColor: '#000',
				display: 'none'
			});
			document.body.insertBefore(this.overlay, document.body.childNodes[0]);
		}
	},
	moveDialogBox: function(where) 
	{
		Element.remove(this.dialog_box);
		if(where == 'back')
			this.dialog_box = this.parent_element.appendChild(this.dialog_box);
		else
			this.dialog_box = this.overlay.parentNode.insertBefore(this.dialog_box, this.overlay);
	},
	show: function() 
	{
		if (Prototype.Browser.IE)
		{
			this.overlay.style.height = document.documentElement.clientHeight + 'px';
		}
		else
		{
			this.overlay.style.height = document.body.getHeight() + 'px';
		}
		this.moveDialogBox('out');
		// this.overlay.onclick = this.hide.bind(this);
		new Effect.Appear(this.overlay, {duration: 0.1, from: 0.0, to: .75});
		this.dialog_box.style.display = 'block';

	},
	hide: function() 
	{
		new Effect.Fade(this.overlay, {duration: 0.1});
		this.dialog_box.style.display = 'none';
		this.moveDialogBox('back');
	}
});