TABLE TEST
by yasumodev
HTML
<table border="1">
<tr><td>ああああ</td></tr>
<tr><td>いいいい</td></tr>
<tr class="anchor" style="display:none;"></tr>
<tr><td>うううう</td></tr>
</table>
<input type="button" value="ぼたん" onclick="go()">
JavaScript
var cnt = 0;
function go()
{
cnt++;
var row = '<tr><td>にゅー'+ cnt +'</td></tr>';
$("tr.anchor").before(row);
}