Change from using a div to a span on the highslide caption for use with Insert module and Line Break input filter.

#649750: Repair hook_insert_content() callback to use _highslide_formatter() instead of deprecated highslide_field_formatter().

Fix captions not displaying when using the image description, and better error handling for other caption fields.

Add support for choosing specific CCK formatters for thumbnail and full size in a highslide formatter.