function addCookie(objName,objValue,objHours)
{//添加cookie
    
    document.getElementById("del").onclick();
    var str = objName + "=" + escape(objValue);
    if(objHours > 0)
    {//为0时不设定过期时间，浏览器关闭时cookie自动消失
        var date = new Date();
        var ms = objHours*3600*1000;
        date.setTime(date.getTime() + ms);
        str += "; expires=" + date.toGMTString();
    }
    document.cookie = str;
    //alert("添加cookie成功");
}
function countTime()
{
    var myDate = new Date();
    return (24 - myDate.getHours());
}

function getCookie(objName)
{//获取指定名称的cookie的值
    var arrStr = document.cookie.split("; ");
    for(var i = 0;i < arrStr.length;i ++)
    {
        var temp = arrStr[i].split("=");
        if(temp[0] == objName) 
        {
            return unescape(temp[1]);
        }
    } 
}