loginform = function() {
    $('field-1').observe('focus', function(e) { if (this.value == 'Login') this.value = ''});
    $('field-2').observe('focus', function(e) { if (this.value == 'Hasło') this.value = ''});
    
    $('field-1').observe('blur', function(e) { if (this.value == '') this.value = 'Login'});
    $('field-2').observe('blur', function(e) { if (this.value == '') this.value = 'Hasło'});
}