// JavaScript Document
function GetCookie (name) { 
  var arg = name + "="; 
  var alen = arg.length; 
  var clen = document.cookie.length; 
  var i = 0; 

  while (i < clen) { 
    var j = i + alen; 

   if (document.cookie.substring(i, j) == arg) 
       return getCookieVal (j); 

      i = document.cookie.indexOf(" ", i) + 1; 

 if (i == 0) break; 

} 

return null;

}

function DeleteCookie_ (name) { 
  var exp = new Date(); 
  exp.setTime (exp.getTime() - 1); 
  var cval = GetCookie (name); 
  document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();

}


function Logout() {
var logged = GetCookie('logged');
var logat = GetCookie('logat');
DeleteCookie_ (logged);
DeleteCookie_ (logat);
}