<script type="text/javascript">
jQuery(document).ready(function($){
$('input[name="item_meta[643][]"], input[name="item_meta[643][other_2]"]').change(function(){
var val1 = $("input[name='item_meta[643][]']:checked").length,
val2 = $("input[name='item_meta[643][]']:checked") ? 1 : 0,
tot_count = val1 + val2;
$("#field_wzfsfs").val(tot_count);
$("#field_wzfsfs").change();
});
});
</script>
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