To se još kaže: visual diff

Plugin:

Befor after image slider – lite (čitaj besplatan)

Befor after image slider – premium (čitaj 15$ za licencu za jedan sajt)

Jedan primjer kako to zgodno može izgledati: www.enginethemes.com

How-to linkovi:

http://zurb.com/playground/twentytwenty

http://demosthenes.info/blog/819/A-Before-And-After-Image-Comparison-Slide-Control-in-HTML5