//私有变量
var TransJson = [];

function $(id) {
    return document.getElementById(id);
}

function SetTranCssDefault(id, obj) {
    TransJson[id] = obj;
}

//设置选中的交替CSS
function TransCss(id,objId, defaultCss, actCss) {
    if (TransJson[id] != objId) {
        $(objId+"div").style.display = "block";
        $(objId).className = actCss;
        $(TransJson[id]).className = defaultCss;
        $(TransJson[id]+"div").style.display = "none";
        TransJson[id] = objId;
    }
}

function addCookie(objName, objValue, objHours) {//添加cookie
    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;
}

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]);
    }
}

function delCookie(name) {//为了删除指定名称的cookie，可以将其过期时间设定为一个过去的时间
    var date = new Date();
    date.setTime(date.getTime() - 10000);
    document.cookie = name + "=a; expires=" + date.toGMTString();
}