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

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

function checkCookie(c_name)
{
  a_cookie=getCookie(c_name)
  if (a_cookie!=null && a_cookie!=""){
    return true
  }else{
    false
  }
}