// JavaScript Document

function hover_img(){

		document.getElementById('contenedor').style.background = "url('images/bg.jpg') top center no-repeat";
		document.getElementById('contenedor').style.backgroundPosition = "50% -1080px";
}

function out_img(){

		document.getElementById('contenedor').style.background = "url('images/bg.jpg') top center no-repeat";
		document.getElementById('contenedor').style.backgroundPosition = "50% 0";
}