Jquery using selectors after a selector has been used

Jquery using selectors after a selector has been used

So I have this:
<tr id="thisRow">
<td>
<label for="pen1">Pen 1</label><input type="checkbox" name="pen1"
/><br />
<label for="pen2">Pen 2</label><input type="checkbox" name="pen2"
/><br />
</td>
</tr>
I use this jquery to get the row:
function GetRow(value) {
var row = $("#"+value);
}
Now I have the row in memory, I really want to start modify a few cells in
that row and then adding it to a different table altogether...