这个例子主要学习两个参数onblur和onFocus.因为这两个参数以前很少遇到,baidu 一下明白了，onblur 是控件在失去焦点的时候触发的事件,而onFocus就是成为输入焦点的时候触发的事件,这两个参数都可以和className结合直接调用样式表类名
代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title></title>
</head>
<body>
<style type="text/css">
.input1{
font-family: verdana;background-color: #EEEEEE;border-bottom: #FFFFFF 1px solid;border-left: #CCCCCC 1px solid;border-right: #FFFFFF 1px solid;border-top: #CCCCCC 1px solid;font-size: 12px;
}
.input1-bor {
font-family:verdana;background-color:#F0F8FF;font-size: 12px;
border: 1px solid #333333;}
</style>
<table cellspacing=2 cellpadding=0 width=300 border=0>
<tr>
<td><font class="en1">姓名:</font> </td>
<td><input size=40 name=name class="input1" onblur="this.className='input1'" onfocus="this.className='input1-bor'">
</td>
</tr>
<tr>
<td><font class="en1">邮箱:</font></td>
<td><input size=40 name=email class="input1" onblur="this.className='input1'" onfocus="this.className='input1-bor'"></td>
</tr>
<tr>
<td><font class="en1">网址:</font> </td>
<td><input size=40 name=url class="input1" onblur="this.className='input1'" onfocus="this.className='input1-bor'">
</td>
</tr>
<tr>
<td><font class="en1">主题:</font> </td>
<td><input size=40 name=subject class="input1" onblur="this.className='input1'" onfocus="this.className='input1-bor'">
</td>
</tr>
<tr>
<td><font class="en1">内容: </font> </td>
<td><textarea name=message rows=5 cols=35 class="input1" onblur="this.className='input1'" onfocus="this.className='input1-bor'"></textarea></td></tr></table>
</body>
</html>