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

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