Note: this is a CSS related article, and as such requires basic knowledge of CSS to implement succesfully
For more information on how to add local CSS to your website please refer to: How can I add my local CSS file?
You can resize the Listing Photo Slideshow by using the following CSS snippet:
#SOmonoSlideshow, #SOmonoslideshow { width: 500px; height: 500px; }
This being CSS, you only need to specify whichever width or height you want to override. the values in the example are the default width and height of the slideshow.