function initRequiredFields () {
    collectFields ( 'input' ) ;
    collectFields ( 'textarea' ) ;
    collectFields ( 'select' ) ;
};

function collectFields ( pType ) {
    pElements = document.getElementsByTagName( pType );

    for ( var pPointer = 0 ; ( pFieldSelection = pElements[ pPointer ]) ; pPointer++ ) {
        if ( pFieldSelection.id.match ( 'req_' ) || pFieldSelection.name.match ( 'req_' ) ) {
            updateFieldStatus ( pFieldSelection ) ;

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

function updateFieldStatus ( pField ) {
    pLabel = getLabelForId ( pField.id ) ;

    if ( pField.value.length == 0 || pField.value == '{txt_ausfuellen}' ) {
        pLabel.className = 'required';
    } else {
        pLabel.className = 'completed';
    }
};

function getLabelForId ( pFieldID ) {
    pLabels = document.getElementsByTagName( 'label' ) ;

    for ( var pPointer = 0 ; ( pLabelSelection = pLabels[ pPointer ]) ; pPointer++ ) {
        if ( pLabelSelection.htmlFor == pFieldID ) {
            return pLabelSelection ;
        }
    }
    return false ;
};

if (typeof collectTriggers == 'function') {
        collectTriggers("initRequiredFields()");
}
else{
    if (document.attachEvent)
    attachEvent("onload", initRequiredFields);
    else addEventListener("load", initRequiredFields, false);
}