// Cookie Functions
function create_cookie(name,value,minutes) {
  if (minutes) {
    var date = new Date();
    date.setTime(date.getTime()+(minutes*60*1000));
    var expires = "expires="+date.toGMTString();
  }
  else var expires = "";
  document.cookie = name+"="+value+"; "+expires+"; path=/";
}

function get_cookie(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 erase_cookie(name) {
  create_cookie(name,"",-1);
}