I have picture library at the root site which feeds input for OOTB Picture Library slideshow webpart. I have a requirement to have Slideshow webpart on subsites as well with the same pool of pictures (with some exception determined by field value). As this webpart has access to picture library at its site level, I am trying to come up with solution where any slideshow webpart can source pictures from same picture library at the root site. Apart from easy solution of creating picture library on each site, I have come across quick solution extending CQWP, JQuery, CSS and XSL which works great! but looses out some of controls users get in OOTB slideshow web part. Is it possible to extend slideshow webpart to allow any picture library within current site collection?