<div id='div1'>
<div id='div2'><p></p></div>
<div id='div3' class='a'><p></p></div>
<div id='div4'><p></p></div>
</div>
<script src="jquery-1.2.6.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#btn1").click(function(){
alert($(this).parent().next().html());
});
});
</script>
</head>
<body>
<table>
<tr>
<td><input id="btn1" class="btn" type="button" value="test" /></td>
<td>some text</td>
</tr>
</table>
