function apri_footer(pag)
{
 var w = 500;
 var h = 400;
 var l = Math.floor((screen.width - w) / 2);
 var t = Math.floor((screen.height - h) / 2);
 window.open("http://www.agustawestland.com/" + pag + ".html", "", "width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}

function apri_credits()
{
 cred = window.open("http://www.agustawestland.com/pop_credits.html", "credits", "top=35,left=20,width=160,height=160")
}