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<label><input type="checkbox" name="foo"> Foo</label>
<label><input type="checkbox" name="bar"> Bar</label>
<script>
$(function () { 
    $.fn.extend({
        check: function() {
            return this.each(function() {
                this.checked = true;
            });
        },
        uncheck: function() {
            return this.each(function() {
                this.checked = false;
            });
        }
    });
    // Using the newly created .check() method
    $( "input[type='checkbox']" ).check();
})
</script>