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                <!-- Based on -->
<!-- Tutorial en español en -->
<table border="1">
    <th><input type="checkbox" id="selectall"></th>
    <td><input type="checkbox" class="case" name="case[]" value="1"></td>
    <td>Fulano de Tal y Cual</td>
    <td align="center"><input type="checkbox" class="case" name="case[]" value="2"></td>
    <td>Irene Sal de la Cueva</td>
    <td><input type="checkbox" class="case" name="case[]" value="3"></td>
    <td>Zutano Ruiz Ruiz</td>
    <td><input type="checkbox" class="case" name="case[]" value="4"></td>
    <td>Menganito García Cano</td>
    <td><input type="checkbox" class="case" name="case[]" value="5"></td>
    <td>Eric Tacuso</td>




                // Use 'prop' instead of 'attr'
// 'attr' only work the first time, better use 'prop'

// add multiple select/unselect functionality
$("#selectall").on("click", function() {
  $(".case").prop("checked", this.checked);

// if all checkbox are selected, check the selectall checkbox and viceversa
$(".case").on("click", function() {
  if ($(".case").length == $(".case:checked").length) {
    $("#selectall").prop("checked", true);
  } else {
    $("#selectall").prop("checked", false);