function CheckUser() {
    var name = $("#name");
    var pwd = $("#password");
    var code = $("#code");
    if (name.val() == "") {
        alert("请输入用户名称！");
        changeCode();
        name.focus();
        return false;
    }
    if (pwd.val() == "") {
        alert("请输入用户密码！");
        pwd.focus();
        changeCode();
        return false;
    }
    if (code.val() == "") {
        alert("请输入验证码！");
        code.focus();
        changeCode();
        return false;
    }
    if (code.val().toLowerCase() != GetCookie("CheckCode").toLowerCase()) {
        alert("验证码错误！");
        changeCode();
        code.val("");
        code.focus();
        return false;
    }
    return true;
}
function changeCode() {
    $("#imgCode").attr("src", 'CheckCode.aspx?rand=' + Math.random());
    $("#code").val("");
}
function AllReset() {
    var name = $("#name");
    var pwd = $("#password");
    var code = $("#code");
    name.val("");
    pwd.val("");
    code.val("");
    return false;
}
function GetCookie(name) {  //取得名称为name的cookie值  
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen) {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg)
            return getCookieVal(j);
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) break;
    }
    return "";
}
function getCookieVal(offset) {       //取得项名称为offset的cookie值  
    var endstr = document.cookie.indexOf(";", offset);
    if (endstr == -1)
        endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}