ricardobeat/gist:133298

## gistfile1.js
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    </head>
    <body>
        <!--Site-->
        <div id="site">
            <!--container-->
            <div id="container">

                <table width="300" border="1" cellspacing="1" cellpadding="3" summary="sum">
                  <caption>
                    tabela
                  </caption>
					<thead>
                  <tr>
                    <th scope="col">&nbsp;</th>
                    <th scope="col">jan</th>
                    <th scope="col">fev</th>
                    <th scope="col">mar</th>
                    <th scope="col">abr</th>
                    <th scope="col">mai</th>
                    <th scope="col">jun</th>
                    <th scope="col">jul</th>
                    <th scope="col">ago</th>
                    <th scope="col">set</th>
                    <th scope="col">total</th>
                  </tr>
					</thead>
					<tbody>
					 <?php for ($i=1;$i<=4;$i++):?>
                  <tr>
						<td class="first">linha <?=$i?></td>
						<?php for ($j=1;$j<=9;$j++):?>
							<td><?=($j*$i)?></td>
						<?php endfor; ?>
                    <td class="somaLinha"></td>
                  </tr>
					<?php endfor; ?>
					</tbody>
					<tfoot>
                    <th scope="row">total</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th>&nbsp;</th>
                    <th  class="somaLinhas"></th>
                  </tr>
					</tfoot>
                </table>
            </div>
            <!--container-->
        </div>
        <!--Site-->
    </body>
	 <script language="JavaScript" type="text/javascript" src="jquery/jquery-1.3.2.min.js"></script>
	 <script>
		$(function(){
			var $table = $('table')
			,$rows = £('tbody', $table)[0].rows
			,$footer = $('tfoot th:last', $table)
			,row
			,i=0
			,totalGeral=0;

			while (row = rows[i++]) {
				var totalLinha = 0;
				$.each(row.cells,function(k,td){
                                        $td = $(td);
					var val = parseFloat( $td.text() );
					if (!isNaN(val)) {
						totalLinha += val;
					} else if ( $td.is('.somaLinha') ) {
						$td.text(totalLinha);
						totalGeral += totalLinha;
					}
				});
			}

			$footer.text(totalGeral);
		});
	 </script>
</html>
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	</head>
	<body>
	<!--Site-->
	<div id="site">
	<!--container-->
	<div id="container">

	<table width="300" border="1" cellspacing="1" cellpadding="3" summary="sum">
	<caption>
	tabela
	</caption>
	<thead>
	<tr>
	<th scope="col"> </th>
	<th scope="col">jan</th>
	<th scope="col">fev</th>
	<th scope="col">mar</th>
	<th scope="col">abr</th>
	<th scope="col">mai</th>
	<th scope="col">jun</th>
	<th scope="col">jul</th>
	<th scope="col">ago</th>
	<th scope="col">set</th>
	<th scope="col">total</th>
	</tr>
	</thead>
	<tbody>
	<?php for ($i=1;$i<=4;$i++):?>
	<tr>
	<td class="first">linha <?=$i?></td>
	<?php for ($j=1;$j<=9;$j++):?>
	<td><?=($j*$i)?></td>
	<?php endfor; ?>
	<td class="somaLinha"></td>
	</tr>
	<?php endfor; ?>
	</tbody>
	<tfoot>
	<th scope="row">total</th>
	<th> </th>
	<th> </th>
	<th> </th>
	<th> </th>
	<th> </th>
	<th> </th>
	<th> </th>
	<th> </th>
	<th> </th>
	<th class="somaLinhas"></th>
	</tr>
	</tfoot>
	</table>
	</div>
	<!--container-->
	</div>
	<!--Site-->
	</body>
	<script language="JavaScript" type="text/javascript" src="jquery/jquery-1.3.2.min.js"></script>
	<script>
	$(function(){
	var $table = $('table')
	,$rows = £('tbody', $table)[0].rows
	,$footer = $('tfoot th:last', $table)
	,row
	,i=0
	,totalGeral=0;

	while (row = rows[i++]) {
	var totalLinha = 0;
	$.each(row.cells,function(k,td){
	$td = $(td);
	var val = parseFloat( $td.text() );
	if (!isNaN(val)) {
	totalLinha += val;
	} else if ( $td.is('.somaLinha') ) {
	$td.text(totalLinha);
	totalGeral += totalLinha;
	}
	});
	}

	$footer.text(totalGeral);
	});
	</script>
	</html>