function PopupCenter(pageURL, title, w, h) {
    var left = (screen.width / 2) - (w / 2);
    var top = (screen.height / 2) - (h / 2);
    var targetWin = window.open(pageURL, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width=' + w + ', height=' + h + ', top=' + top + ', left=' + left);
}

function confirmdel(deltype) {
    if (window.confirm('Weet u zeker dat u de ' + deltype + ' wilt verwijderen'
                    + '?') == false) {
        return false;
    }
}

function PrintButtonClicked() {
    window.open('print.aspx', 'Printen', 'left=20,top=20,width=950,height=900,toolbar=0,resizable=1');

}