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())+";path=/";
}

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 "";
}