轻量级基于原型的浮动/可调整大小的弹出窗口

What's the best way to implement Meebo-style floating windows? I'd prefer to use Prototype (but if there's a good Jquery implementation I'd be happy to look into it as well). I'd like windows to be draggable/resizable and generally "lightweight" and responsive.What's the best way to implement Meebo-style fl