function initRequiredFields () {
    $( "input, select, textarea" ).each ( function () {
        if ( this.name.match( 'req_' ) ) {
            updateFieldStatus ( this ) ;

            this.onchange = function () {
                updateFieldStatus ( this ) ;
            }
        }
    } ) ;
} ;

function updateFieldStatus ( pField ) {
    if ( pField.value.length == 0 || pField.value == '{txt_ausfuellen}' ) {
        $("label[@for=" + pField.name + "]").addClass('required') ;
        $(pField).addClass('required');
    } else {
//      $("label[@for=" + pField.name + "]").removeClass('required') ;
//      $(pField).removeClass('required');
    }
} ;