Thanks acoggins, this is actually what I have done. I was hoping there was a better solution like dropping the slider completely on mobile so people don't need to download it. Plus it's creating some sideways movement in my page on mobile devices which isn't the best look! So if I could make it no slider on small devices (ass opposed to hiding the slider) I'd feel happier about it!
Ah, right. Could you use something like this to call up a different template without the slider? https://github.com/silverstripe/silverstripe-mobile
"The mobile module provides detection for mobile devices, and can serve a different SilverStripe theme to them. The module can either use redirection to a separate mobile domain, or serve mobile optimised content under the same URLs."