Django: Creating multiple select checkboxes with Forms

class UserlistForm(forms.Form):
    users = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,label="Notify and subscribe users to this post:")

def post_message(request, groupid):
    custgroup = Group.objects.get(id=groupid)
    groupusers = User.objects.filter(groups__name=custgroup.name)
 
    userlistform = UserlistForm()
 
    #This fills up the "choices"
    userlistform.fields['users'].choices = 
        [(x.id, x) for x in User.objects.filter(groups__name=custgroup.name)]
 
    data = {"userlistform":userlistform,}
 
    return render_to_response("message/view_message.html",
                          data, context_instance=RequestContext(request))

{{userlistform.as_p}}

userlist = request.POST.getlist('users')
"""
you will get something like this:
[u'1', u'2', u'3']
"""