HTML
<form method="post" class="myform" action=".">
<table>
<tbody>
<tr>
<th><label for="checkbox1">Checkbox 1</label></th>
<td><input type="checkbox" id="checkbox1" name="checkbox1" /></td>
</tr>
<tr>
<th><label for="checkbox2">Checkbox 2</label></th>
<td><input type="checkbox" id="checkbox2" name="checkbox2" /></td>
</tr>
<tr>
<th><label for="checkbox3">Checkbox 3</label></th>
<td><input type="checkbox" id="checkbox3" name="checkbox3" /></td>
</tr>
</tbody>
</table>
<input type="submit" class="myform-submit" />
</form>
ジャバスクリプト(仮定jqueryの)
$(document).ready(function(){
$(".myform-submit").bind("click", function(e) {
e.preventDefault();
var $form = $(this).closest(".myform");
if ($("input:checkbox:checked").length) {
alert("submitting");
$form.submit();
}
});
});
jsfiddle
http://jsfiddle.net/c4urself/xWbEk/