Use the URL field type to store an URL
Create an URL field type using
bw_register_field( "_oikth_demo", "URL", "Live demonstration" ); bw_register_field_for_object_type( "_oikth_demo", "oik-themes" );
Form display
When displayed in the Fields meta box or [bw_new] it appears like this.
bw_fields display
When displayed by [bw_fields] it appears like this.
Notes
It should not be necessary to use the URL field type for links to content on the current site; use noderef.

