aspx 文件中编排格式后 页面乱掉了

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="SZGYYQ_GZHR.Login" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>登录到苏州工业园区国资人事监管平台</title>
    <link href="css/Login.css" type="text/css" rel="stylesheet" />
    <asp:Literal runat="server" id="ltlPrinter" enableViewState="false" />
</head>
<body class="body" scroll="no">
    <form id="form1" runat="server">
    <table class="table">
        <tr>
        <td colspan="3">
        <img src="Images/Login/Login_2.jpg"></td>
        </tr>
        <tr>
        <td align="right">
        <img src="Images/Login/Login_3.jpg"></td>
        <td class="tdLogin">
        <table class="tbLogin">
                    <tr>
                        <td nowrap="nowrap" class="tdinput">
                            用 户：
                        </td>
                        <td width="131px;">
                            <asp:TextBox ID="txtUserName" runat="server" TabIndex="1" CssClass="inputtxt" Height=20px></asp:TextBox>
                        </td>
                        <td rowspan="2" class="tdOK">
                            <asp:ImageButton ID="btnLogin" runat="server" TabIndex="3" OnClick="btnLogin_Click"
                                  ImageUrl="Images/Login/Login_1.jpg"/>
                        </td>
                    </tr>
                    <tr>
                        <td class="tdinput">
                            密 码：
                        </td>
                        <td width= "131px;" >
                            <asp:TextBox ID="txtPwd" runat="server" TabIndex="2" TextMode="Password" CssClass="inputtxt" Height=20px></asp:TextBox>
                        </td>
                    </tr>
                </table>
            </td>
        <td> 
        <img src="Images/Login/Login_4.jpg"></td>
        </tr>
        <tr>
        <td colspan="3">
        <img src="Images/Login/Login_5.jpg">
        </td>
        </tr>
        </table>
   </form>
</body>
</html>上面的代码使用自动编排格式后图片拼接的地方会有明显拼接裂缝
我看了下
<td colspan="3">
        <img src="Images/Login/Login_2.jpg"></td>
后面的</td>回车换行后就会出现这个问题了