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

function emGetCookie(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 ""
}