function GetObj(objName) {
    if (document.getElementById) {
        return eval('document.getElementById("' + objName + '")');
    } else if (document.layers) {
        return eval("document.layers['" + objName + "']");
    } else {
        return eval('document.all.' + objName);
    }
}

function s_chg(td_now) {
    for (var i = 1; i <= 5; i++) {
        eval("var s_td_" + i + " = GetObj('s_td_" + i + "')");
    }
    var objKeyWord = GetObj("txtKeyWord");
    var objType = GetObj("hidType");

    s_td_1.className = s_td_2.className = s_td_3.className = s_td_4.className = s_td_5.className = "s_td_of";
    td_now.className = "s_td_on";

    if (td_now.id == "s_td_1") {
        objType.value = "author";//作者
    }
    if (td_now.id == "s_td_2") {
        objType.value = "book"; //书名
    }
    if (td_now.id == "s_td_3") {
        objType.value = "comment"; //书评
    }
    if (td_now.id == "s_td_4") {
        objType.value = "publisher"; //出版社
    }
    if (td_now.id == "s_td_5") {
        objType.value = "all"; //综合
    }
}

//打开搜索页面
function GoToSearchPage(tip, e) {
    var keyCode = keyDownCode(e);
    if (keyCode == 13 || tip == 1) {
        var objKeyWord = GetObj("txtKeyWord");
        var objType = GetObj("hidType");
        if (objKeyWord.value == "") {
            alert("关键字不能为空");
        } else {
            var SubmitButton = GetObj("Submit1");
            SubmitButton.click();
        }
    }
}

//按键事件
function keyDownCode(e) {
    var code;
    if (!e) {
        var e = window.event;
    }
    if (e.keyCode) {
        code = e.keyCode;
    }
    else if (e.which) {
        code = e.which;
    }
    return code;
}