请教高手：如何判断上下滚动条是否滚动到页面最下方？

Question

clientHeight --------------------------------------------------------------------------------Retrieves the height of the object including padding, but not including margin, border, or scroll bar. 
scrollHeight--------------------------------------------------------------------------------Retrieves the scrolling height of the object. 
scrollTop--------------------------------------------------------------------------------Sets or retrieves the distance between the top of the object and the topmost portion of the content currently visible in the window. 

Answer 1

scrollTop的例子
http://msdn.microsoft.com/workshop/samples/author/dhtml/refs/scrollTop.htm

Answer 2

scrollHeight的例子
http://msdn.microsoft.com/workshop/samples/author/dhtml/refs/scrollHeight.htm