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// all selected checkboxes as Array

var values = $('input:checkbox:checked.group1').map(function () {
  return this.value;
}).get(); // ["18", "55", "10"]

// http://stackoverflow.com/questions/2099164/jquery-array-of-all-selected-checkboxes-by-class
// http://stackoverflow.com/questions/416752/select-values-of-checkbox-group-with-jquery