/*
Class: Rako Background [Built on MooTools framework: www.mootools.net]
Author: Martin Jezek 2011
Version: 1.1
*/  
var RakoBackground=new Class({Implements:Options,options:{bg_id:"bg",ratio:0.5},initialize:function(options){this.setOptions(options);if($(this.options.bg_id)){this.initBg();this.refresh();this.addEvents();}},width:0,height:0,initBg:function(){this.bg=$(this.options.bg_id);},refresh:function(){this.width=this.bg.getWidth();this.height=(this.width*this.options.ratio).round();this.bg.setStyle("height",this.height);},addEvents:function(){window.addEvent("resize",this.refresh.bind(this));}});