// JavaScript Document
jQuery(document).ready(
  function (){
	var v = ['images/bg/fons0.jpg', 'images/bg/fons1.jpg', 'images/bg/fons2.jpg', 'images/bg/fons3.jpg', 'images/bg/fons4.jpg'];
	var randomnumber=Math.floor(Math.random()*v.length);
	jQuery('#fons').css('background','url('+v[randomnumber]+') no-repeat center top'); 
}

);