as i think (and the comments) ... you're new using jquery...
so with jquery its very easy... append/appendTo is what you're looking for ...
if you want to add TDs more than one table it's not usefull to use ID attributes. because W3C says that IDs are unique on a page... better use the class attribute...
<table class="floatTable">
<tbody>
<tr class="footerRow">
</tr>
</tbody>
</table>
// Select all TRs in the floatTable having the class footerRaw
$('.floatTable tr.footerRaw').each(function(key, el)) {
// here you could define anything whatever you want
var tdContent = 'Lorem ipsum dolor';
// For example add five TDs to your table
for ( var i = 0; i < 5; i++ ) {
// if it works ;-)
// ...it should add following:
// <td>Lorem ipsum dolor #1</td>
// <td>Lorem ipsum dolor #2</td>
// ...and so on...
$(this).append('<td>' + tdContent + ' #' + i + '</td>');
}
});
here's an running example... http://jsfiddle.net/2am6wcm8/