//poner cookie de referer
function setCookie(name, value, expires, path, domain, secure)
{
    document.cookie= name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires.toGMTString() : "") +
        ((path) ? "; path=" + path : "/") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
}
function getCookie(name)
{
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1)
    {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    }
    else
    {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1)
    {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}
if (getCookie("imfsdi") == null) {
  setCookie("imfsdi",document.location.href); //raíz
}
if (getCookie("imfsdireferrer") == null) {
  setCookie("imfsdireferrer",document.referrer); //raíz
}