如何使用jQuery获取div的完整内容的高度？

I am trying to create my own scroll bars. I have tried most of the jquery scrollbar plugins and none of them seem to work for me, so I decided to create my own. I have an overflow area with scrollable content. I can get the scrollbar to work if I am able to figure out the height of the scrollable content area. I have tried .scrollHeight() and the browser doesn't even recognize it. The overflow area has a fixed position. I am trying to create my own scroll bars. I hav