How to select multiple items using mouse click?

This is the default jQueryUI display as a Grid Layouts (demo here). I can select one at a time when using mouse pointer. I have to use Ctrl for multiple selections. How will I edit the code for multiple selections at once using just the mouse pointer? CSS ``` <style> #feedback { font-size: 1.4em; } #selectable .ui-selecting { background: #FECA40; } #selectable .ui-selected { background: #F39814; color: white; } #selectable { list-style-type: none; margin: 0; padding: 0; } #selectable li { margin: 3px; padding: 1px; float: left; width: 100px; height: 80px; font-size: 4em; text-align: center; } </style> ``` JavaScript ``` <script> $(function() { $( "#selectable" ).selectable(); }); </script> ``` HTML ``` <div class="demo"> <ol id="selectable"> <li class="ui-state-default">1</li> <li class="ui-state-default">2</li> <li class="ui-state-default">3</li> <li class="ui-state-default">4</li> <li class="ui-state-default">5</li> <li class="ui-state-default">6</li> <li class="ui-state-default">7</li> <li class="ui-state-default">8</li> <li class="ui-state-default">9</li> <li class="ui-state-default">10</li> <li class="ui-state-default">11</li> <li class="ui-state-default">12</li> </ol> </div><!-- End demo --> <div class="demo-description"> <p>To arrange selectable items as a grid, give them identical dimensions and float them using CSS.</p> </div><!-- End demo-description --> ```