function ladeseite(URI){
    location.href = URI;
}

function checklength(field, countfield, maxlimit) {

    if (field.value.length > maxlimit){
       field.value = field.value.substring(0, maxlimit);
    } else {
       countfield.value = maxlimit - field.value.length;
    }

}

function zeige(feld){
    document.getElementById(feld).style.visibility = "visible";
}