function saveCookie(name,value,days) {
       if (days) {
             var date = new Date();
             date.setTime(date.getTime()+(days*24*60*60*1000))
             var expires = "; expires="+date.toGMTString()
       }
       else expires = ""
       document.cookie = name+"="+value+expires+"; path=/"
}

function readCookie(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;
}