var cookier = {
    set:function(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=/")
    },
    get:function(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 ""
    },
    del:function(c_name){
        var exp = new Date(); 
        exp.setTime(exp.getTime() - 1000); 
        var cval=getCookie(c_name); 
        if(cval!=null) 
        document.cookie= c_name + "="+cval+";expires="+exp.toGMTString()+";path=/"; 
    }
}