/**
* @package			overlay.js
* @dependence		prototype.js - v1.5.1.1
* @version			0.1.2
* browser test		FF 2.0.0.x / IE 6.0 and 7.0
* @license			GNU GPL 2.0
* @author 			Alvaro A. Lima Jr <alvarolimajr@gmail.com>
* @copyright 		Alvaro Junior! <http://alvarojunior.net>
*/
if(typeof(Prototype) == 'undefined' || parseFloat(Prototype.Version) < 1.5)
	throw("dialog.js requires the Prototype JavaScript framework >= 1.5.0");

var Dialog = {};

/**
* Usage :
*  - Dialog.show(element,options);
*  -- options = {scroll : true, zIndex: 999};
*/
Dialog = {
	/**
	* @access public
	*/
	version: '0.1.2',

	/**
	* Método construtor
	* @access private
	*/
	__init__: function(element,options) {
		this._element = $(element);
		this._setOptions(options);
		this._center();
		Event.observe(window, 'resize', this._center.bindAsEventListener(this));
		Event.observe(window, 'scroll', this._center.bindAsEventListener(this));
	},

	/**
	* @access protected
	*/
	_setOptions: function(options) {
		this.options = {
			scroll: false,
			zIndex: 9999
		};
		Object.extend(this.options, options || {});
	},

	_center: function() {
		if(!this._element._centered){
			this._element.setStyle({position: 'absolute', zIndex: this.options.zIndex });
			this._element._centered = true;
        }
		var dims = Element.getDimensions(this._element);
		Position.prepare();
		var winWidth = self.innerWidth || document.documentElement.clientWidth || document.body.clientWidth || 0;
		var winHeight = self.innerHeight || document.documentElement.clientHeight || document.body.clientHeight || 0;
		var offLeft = (Position.deltaX + Math.floor((winWidth-dims.width)/2));
		var offTop = (Position.deltaY + Math.floor((winHeight-dims.height)/2));
		var t = ((offTop != null && offTop > 0) ? offTop : '0')	+ 'px';
		var l = ((offLeft != null && offLeft > 0) ? offLeft : '0') + 'px';
		this._element.setStyle({top :t , left: l});
	},

	show: function(element,options) {
		this.__init__(element,options);
		var body = document.getElementsByTagName('body').item(0);
		body.insertBefore(this._element, body.firstChild);
		this._element.show();
	},

	hide: function() {
		this._element.hide();
	}
};