各位大侠，现求一段JavaScript代码，当选择checkbox中的“其他文件”时弹出一对话框，对话框内显示出一个文本行
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>放款审核资料 </title>
</head>
<BODY class=panel leftMargin=1 topMargin=1 rightMargin=1
marginheight="0" marginwidth="0" onload="javascript:f_onload()">
<div align="center">
<form name="form11" method="post">
<table border="0" width="100%" cellspacing="0" cellpadding="3"
class="small">
<tr>
<td class="Big" align="center">
<img src="images/edit.gif" WIDTH="22" HEIGHT="20"
align="absmiddle">
</td>
</tr>
</table>
<a href="javascript:menu_expand()"> <u> <span id="expand_text">收缩 </span>
</u> </a>
<table border="0" cellspacing="2" class="small" cellpadding="3"
align="center">
<tr class="Tab
