选中复选框查询将数据连接起来

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
//点击查看按钮
function button(){
var cs=document.getElementsByTagName('input');
var arr=[];
for(var i=0,len=cs.length;i<len;i++){
if(cs[i].type.toLowerCase()=='checkbox'&&cs[i].checked&&cs[i].id.toLowerCase()!='picallcheck'){
var l=getNextElementSibling(cs[i].parentNode);
var ll=getNextElementSibling(l);
arr.push(l.innerHTML+'*'+ll.innerHTML);
}
}
alert(arr.join('&'));
}
function getNextElementSibling(dom){
dom=dom.nextSibling;
while(dom&&!dom.tagName){
dom=dom.nextSibling;
}
return dom;
}
</script>
</head>
<body>
<table cellspacing="0" cellpadding="0" border="0" class="tableclass">
  <tbody>
    <tr class="tablethtr">
      <td><input type="checkbox" onclick="PicAllCheckaa(this)" name="PicAllCheck" id="PicAllCheck">全选</td>
      <td>序号</td>
      <td>时间</td>
    </tr>
  </tbody>
  <tbody id="Tbody">
    <tr>
      <td><input type="checkbox" name="checkbox" id="checkbox1"></td>
      <td>1</td>
      <td>2014-07-08 15:14:31</td>
    </tr>
    <tr>
      <td><input type="checkbox" name="checkbox" id="checkbox2"></td>
      <td>2</td>
      <td>2014-07-08 15:14:32</td>
    </tr>
    <tr>
      <td><input type="checkbox" name="checkbox" id="checkbox3"></td>
      <td>3</td>
      <td>2014-07-08 15:14:33</td>
    </tr>
    <tr>
      <td><input type="checkbox" name="checkbox" id="checkbox4"></td>
      <td>4</td>
      <td>2014-07-08 15:14:34</td>
    </tr>
    <tr>
      <td><input type="checkbox" name="checkbox" id="checkbox5"></td>
      <td >5</td>
      <td >2014-07-08 15:14:35</td>
    </tr>
  </tbody>
</table>
<input type="button" value="查看" onclick="button()" />
</body>
</html>