# forms.py
from django import forms
from django.contrib.admin.widgets import FilteredSelectMultiple

class TagForm(forms.Form):
    tags = forms.ModelMultipleChoiceField(queryset=Tag.objects.all(),
                                          label=_('Select tags'),
                                          required=False,
                                          widget=FilteredSelectMultiple(
                                                    _('tags'),
                                                    False,
                                                 ))

    class Media:
        css = {
            'all':['admin/css/widgets.css',
                   'css/uid-manage-form.css'],
        }
        # Adding this javascript is crucial
        js = ['/admin/jsi18n/']

#######################
# template
<!--HEAD -->
{{ form.media }}
<!--BODY-->
{{ form }}

#######################
# extra css

.selector{
    float:none;
    display:block;
    height:330px;
}

.selector input[type="submit"]{
    display:block;
    clear:both;
}

.selector h2{
    font-size:15px;
}
.selector  select{
    margin: 2px 0;
    padding: 2px 3px;
    font-weight: normal;
    width: 270px !important;
    height: 17.2em;
}

textarea{
    display:block;
    width:450px;
}