jQuery Grid Plugin - jqGrid

i modi the jqgrid demo 38array2.html use Chinese Characters in content and column name.But the right tabs are displayed as junk characters in jqgrid v3.80 demo;
like:
![right tabs][1]
code:
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<div style="font-size:12px;">
    It is possible to tell the grid to hide the grouping column.<br/>
    This is done with the groupColumnShow option in the groupingView object.<br/><br/>
    Note that all groupingView options can be changed dynamically.这个显示怎么活？
</div>
<br />
<table id="list482"></table>
<div id="plist482"></div>
<script src="38array2.js" type="text/javascript"></script>
<br />
<div style="font-size:12px;">

  [1]: http://i.imgur.com/snVB1.jpg