function setCookie(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 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 "";
}