Compare images

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I've been asked if this could be suggested for future builds. Occassionaly we have pictures that need to be compared, lets say a before and after. In our case several pictures. Before, during and after. Therefore could it be possible to code several pictures side by side for comparison? At the moment the only option is to open multiple browsers. You'll have to judge wether or not this would be a popular addition to the Coppermine community or maybe best left for someone to create a mod or plugin.
Regards
Steff.