function getCookie(name) {
   var dc = document.cookie;
   var prefix = name + "=";
   var begin = dc.indexOf("; " + prefix);
   if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
   }else{
    begin += 2;
   }
   var end = document.cookie.indexOf(";", begin);
   if (end == -1) {
    end = dc.length;
   }
   return unescape(dc.substring(begin + prefix.length, end));
  }

  function setCookie(cookie_name,cookie_value,cookie_path,cookie_expires){
   document.cookie=cookie_name+"="+cookie_value+"; path="+cookie_path+"; expires="+ cookie_expires;
  }

 function delCookie(cookiename,path){
  if(document.cookie){
   document.cookie=cookiename+"=;path="+path+";expires=Thu, 01-Jan-1970 00:00:01 GMT";
  }
  return(true);
 }

  function createCookieDate(expire_days){
   var _date=new Date();
   _date.setTime(_date.getTime()+(expire_days*24*60*60*1000));
   return(_date.toGMTString());
  }