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This plugin is completely free for use in any context or connection.
picslider.swf
FPP hotspot plugin for showing two images on top of each other with a movable vertical divider. The first image is shown to the left of the divider, and the second image to the right. Can be used to compare two images like "before/after", "day/night" or "summer/winter".
The following hotspot attributes are supported in the FPP XML file:

image1image1="images/before.png"image shown to the left of the slider
image2image2="images/after.png"image shown to the right of the slider
frameColorframeColor="#FFFFFF"frame color, default: no frame
frameWidthframeWidth="3"frame width, default: 2


NOTES:

If you want the image frame to be drawn, you have to include the frameColor attribute.