前臺html及js腳本：

[html]
代碼如下:
<div>
    <table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td bgcolor="#CC66FF" 
                style="WIDTH: 990px; HEIGHT: 5px; BACKGROUND-COLOR: #ffffff; text-align: center;">
            </td>
        </tr>
        <tr>
            <td style="BORDER-RIGHT: #cccc99 1px solid; BORDER-TOP: #cccc99 1px solid; BORDER-LEFT: #cccc99 1px solid; WIDTH: 990px; BORDER-BOTTOM: #cccc99 1px solid">
                <table border="0" cellpadding="0" cellspacing="0">
                    <tr>
                        <td style="WIDTH: 990px; BACKGROUND-COLOR: #ffffff">
                            <div style="WIDTH: 990px; HEIGHT: 139px">
                                <div id="demo" 
                                    style="PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; OVERFLOW: hidden; WIDTH: 100%; COLOR: #ffffff; PADDING-TOP: 0px">
                                    <table align="left" border="0" cellpadding="0" cellspace="0" cellspacing="0" 
                                        style="WIDTH: 900px; HEIGHT: 139px">
                                        <tr>
                                            <td id="demo1" valign="top">