使用Smarty PHP模板构建移动站点

I have a custom built app that uses smarty. I need my app to support mobile devices (iphones, driods etc...) I know that the general web looks ok, and that also in many cases I can use CSS hacks, but is there a way in Smarty to detect what browser is being used then serve up templates based on that request? I have a custom built app that uses smarty. I n