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    $("select.refines").change(function () {
        document.location = $(this).val();
    });
    
    $("#btnAdd, #btnAdd2").click(function(event) {
        if ($("#aantal").val() == "" || !is_numeric($("#aantal").val())) {
            alert("U dient het aantal op te geven.");
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    $("table tr.trainingitem").click(function() {
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});