Produces a thumbnail image, linked to the image asset currently in context.

Attributes:

• height

  The height of the thumbnail to generate. If this is the only parameter specified then the thumbnail's width will be scaled proportionally to the height.

• width

  The width of the thumbnail to generate. If this is the only parameter specified then the thumbnail's height will be scaled proportionally to the width.

• scale

  The percentage by which to reduce or increase the size of the current asset.

• new_window (optional; default "0")

  If set to '1', causes the link to open a new window to the linked asset.