http://viju.tvercity.net/ru/weblog/lightbox-%D0%B4%D0%BB%D1%8F-%D0%BA%D0…
 
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/admin/settings/filters/2/configure
 
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Link to the original:

If resized, add a link to the original image. Optionally, give it the class: lb and/or a rel attribute: lightbox
 

Linking to the original can be helpful to give users a full-size view of the image. Adding the class «thickbox» is helpful if you have installed the thickbox module. The rel attribute may be useful when used with the lightbox2 and shadowbox modules.