怎样在网页中插入图片滚动代码?

<div id="demo" style="overflow:hidden;width:670px;color:#ffffff;">
<table cellpadding="0" cellspacing="0" border="0">
<tr><td id="demo1" valign="top" align="center">
<table cellpadding="2" cellspacing="0" border="0">
<tr align="center">
<td><img src="http://www.baidu.com/img/logo.gif" ></td>
<td><img src="http://www.baidu.com/img/logo.gif" ></td>
<td><img src="http://www.baidu.com/img/logo.gif