[web2py] jquery effect

[黄祥]

hi,

i've read and try to implement form select jquery on the book
http://web2py.com/book/default/chapter/10#Conditional-Fields-in-Forms,
but have no effect.

e.g.
<script>
jQuery(document).ready(function(){
    jQuery('#blog_visibility').change(function(){
        if(jQuery('#blog_visibility').attr('Protected'))
            jQuery('#blog_password__row').show();
        else
            jQuery('#blog_password__row').hide();});
});
</script>

and

<script>
jQuery(document).ready(function(){
    if(jQuery('#blog_visibility').attr('onchange','Protected'))
        jQuery('#blog_password__row').show();
    else
        jQuery('#blog_password__row').hide();
});
</script>

i know i have wrong code, did anyone knows how to fixed it?

thank you so much in advance