source: trunk/www.guidonia.net/wp/wp-admin/js/custom-fields.dev.js@ 44

jQuery(document).ready( function($) {
        var before, addBefore, addAfter, delBefore;

        before = function() {
                var nonce = $('#newmeta [name=_ajax_nonce]').val(), postId = $('#post_ID').val();
                if ( !nonce || !postId ) { return false; }
                return [nonce,postId];
        }

        addBefore = function( s ) {
                var b = before();
                if ( !b ) { return false; }
                s.data = s.data.replace(/_ajax_nonce=[a-f0-9]+/, '_ajax_nonce=' + b[0]) + '&post_id=' + b[1];
                return s;
        };

        addAfter = function( r, s ) {
                var postId = $('postid', r).text(), h;
                if ( !postId ) { return; }
                $('#post_ID').attr( 'name', 'post_ID' ).val( postId );
                h = $('#hiddenaction');
                if ( 'post' == h.val() ) { h.val( 'postajaxpost' ); }
        };

        delBefore = function( s ) {
                var b = before(); if ( !b ) return false;
                s.data._ajax_nonce = b[0]; s.data.post_id = b[1];
                return s;
        }

        $('#the-list')
                .wpList( { addBefore: addBefore, addAfter: addAfter, delBefore: delBefore } )
                .find('.updatemeta, .deletemeta').attr( 'type', 'button' );
} );