//获取Cookie
   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 "";
   }
   //设置Cookie
   function setCookie(c_name,value,expiredays)
   {
     var exdate=new Date();
     exdate.setTime(exdate.getTime()+expiredays*864000000);
     document.cookie=c_name +"="+escape(value)+((expiredays==null)?"":";expires="+exdate.toGMTString());";path=/;Domain=.okpai.com";
   }