There's a couple of ways you could go about that. If you you know a bit about code you could:
1. Do a media query and using CSS overwrite the size of the images on mobile:
@(max-width: 320px){
.slideshow img {
width: 100% !important;
}
}
That's NOT realy code, but something like that....
2. You could also do something similar with javascript...
if($(document).width() < 320){
slideshowWidth = 320;
// Re-Init Slideshow
$("#slideshow").cycle({width: 320});
}
... something like that (also not realy code)
I would recommend the first one... seems easier...
Let me know if it works!