function check_order() {
    var name = document.getElementById("name").value;
    var phone = document.getElementById("phone").value;
    var num = parseInt(document.getElementById("num").value);

    if (name.length == 0) {
        alert("姓名不能为空！");
        document.form1.name.focus();
        return false;
    }
    else if (phone.length == 0) {
        alert("联系电话不能为空！");
        document.form1.phone.focus();
        return false;
    }
    else if (num == 0) {
        alert("订票数量不合法！");
        document.form1.num.focus();
        return false;
    }
    else if (!/^\d+$/.test(num)) {
        alert("订票数量只能输入数字！");
        document.form1.num.focus();
        return false;
    }
    document.form1.num.value = parseInt(num);
    return true;
}

function check_guestbook() {
    var username = document.getElementById("username").value;
    var phonenumber = document.getElementById("phonenumber").value;
    var email = document.getElementById("email").value;
    var content = document.getElementById("content").value;

    if (username.length == 0) {
        alert("姓名不能为空！");
        document.form1.username.focus();
        return false;
    }
    else if (phonenumber.length == 0) {
        alert("联系电话不能为空！");
        document.form1.phonenumber.focus();
        return false;
    }
    else if (email.length == 0) {
        alert("邮件地址不能为空！");
        document.form1.email.focus();
        return false;
    }
    else if (content.length==0) {
        alert("留言内容不能为空！");
        document.form1.content.focus();
        return false;
    }
    
    return true;
}

function ScrollText(content,btnPrevious,btnNext,autoStart)
{
    this.Delay = 10;
    this.LineHeight = 20;
	this.Amount = 1;//注意:LineHeight一定要能整除Amount.
	this.Direction = "up";
    this.Timeout = 1500;
    this.ScrollContent = this.$(content);
    this.ScrollContent.innerHTML += this.ScrollContent.innerHTML;
    //this.ScrollContent.scrollTop = 0;
    if(btnNext)
    {
        this.NextButton = this.$(btnNext);
        this.NextButton.onclick = this.GetFunction(this,"Next");
        this.NextButton.onmouseover = this.GetFunction(this,"Stop");
        this.NextButton.onmouseout = this.GetFunction(this,"Start");
    }
    if(btnPrevious)
    {
        this.PreviousButton = this.$(btnPrevious);
        this.PreviousButton.onclick = this.GetFunction(this,"Previous");
        this.PreviousButton.onmouseover = this.GetFunction(this,"Stop");
        this.PreviousButton.onmouseout = this.GetFunction(this,"Start");
    }
    this.ScrollContent.onmouseover = this.GetFunction(this,"Stop");
    this.ScrollContent.onmouseout = this.GetFunction(this,"Start");
    if(autoStart)
    {
        this.Start();
    }
}

ScrollText.prototype.$ = function(element)
{
    return document.getElementById(element);
}

ScrollText.prototype.Previous = function()
{
    clearTimeout(this.AutoScrollTimer);
    clearTimeout(this.ScrollTimer);
    this.Scroll("up");
}

ScrollText.prototype.Next = function()
{
    clearTimeout(this.AutoScrollTimer);
    clearTimeout(this.ScrollTimer);
    this.Scroll("down");
}

ScrollText.prototype.Start = function()
{
    clearTimeout(this.AutoScrollTimer);
    this.AutoScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Timeout);
}

ScrollText.prototype.Stop = function()
{
    clearTimeout(this.ScrollTimer);
    clearTimeout(this.AutoScrollTimer);
}

ScrollText.prototype.AutoScroll = function()
{
    if(this.Direction == "up")
    {
        if(parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2)
        {
            this.ScrollContent.scrollTop = 0;
        }
        this.ScrollContent.scrollTop += this.Amount;
    }
    else
    {
        if(parseInt(this.ScrollContent.scrollTop) <= 0)
        {
            this.ScrollContent.scrollTop = parseInt(this.ScrollContent.scrollHeight) / 2;
        }
        this.ScrollContent.scrollTop -= this.Amount;
    }
    if(parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0)
    {
        this.ScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Delay);
    }
    else
    {
        this.AutoScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Timeout);
    }
}

ScrollText.prototype.Scroll = function(direction)
{
    if(direction=="up")
    {
        if(this.ScrollContent.scrollTop == 0)
        {
            this.ScrollContent.scrollTop = parseInt(this.ScrollContent.scrollHeight) / 2;
        }
        this.ScrollContent.scrollTop -= this.Amount;
    }
    else
    {
        this.ScrollContent.scrollTop += this.Amount;
    }
    if(parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2)
        {
            this.ScrollContent.scrollTop = 0;
        }
    if(parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0)
    {
        this.ScrollTimer = setTimeout(this.GetFunction(this,"Scroll",direction), this.Delay);
    }
}

ScrollText.prototype.GetFunction = function(variable,method,param)
{
    return function()
    {
        variable[method](param);
    }
}