$(document).ready(function(){
	  bgImageTotal=8;
      randomNumber = Math.round(Math.random()*(bgImageTotal-1))+1;
	  //var cookie = readCookie("imagen");
	  var cookie = getCookie("imagen");
	
	  if (cookie == null || cookie == '') {   
		setCookie('imagen', randomNumber, null);	  
	  	//document.cookie="imagen = "+randomNumber+"; expires = ''";
	  }
      imgPath=('img/bg'+readCookie("imagen")+'.jpg');
      $('body').css('background-image', ('url("'+imgPath+'")'));
  });

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toUTCString());
}

function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}