javascript分页

这种分页方法很不错，以前我竟然不知道，太可怕了！
以下代码生成html文件可见效果：） 
<xml id="users">
<userGroup>
  <user id="1">
    <userid>user 1</userid>
    <name>name 1</name>
  </user>
  <user id="2">
    <userid>user 2</userid>
    <name>name 2</name>
  </user>
  <user id="3">
    <userid>user 3</userid>
    <name>name 3</name>
  </user>
  <user id="4">
    <userid>user 4</userid>
    <name>name 4</name>
  </user>
  <user id="5">
    <userid>user 5</userid>
    <name>name 5</name>
  </user>
  <user id="6">
    <userid>user 6</userid>
    <name>name 7</name>
  </user>
  <user id="7">
    <userid>user 7</userid>
    <name>name 7</name>
  </user>
  <user id="8">
    <userid>user 8</userid>
    <name>name 8</name>
  </user>
  <user id="9">
    <userid>user 9</userid>
    <name>name 9</name>
  </user>
</userGroup>
</xml>
<table id="datatable" datasrc="#users" DATAPAGESIZE="3" width="400" border="1">
<thead>
    <th>数据 userid</th>
    <th>数据 name</th>
    <th>属性 id</th>
</thead>
<tr>
    <td><span datafld="userid"></span></td>
    <td><span datafld="name"></span></td>
    <td><span datafld="id"></span></td>
</tr>
</table>
<button onclick="document.all.datatable.previousPage()">Previous Page</button>
<button onclick="document.all.datatable.nextPage()">Next Page</button>