使用animate.scrolltop和（target）.offset（）计算固定标头.top;

This should be a pretty basic question, but i've thrown most of my morning at it, and at this point I'm close to throwing in the towel. I have not even a little bit of js foo -- but I found a nicely commented chunk of code that I'm hoping to use to animate anchor links it is:This should be a pretty basic question, but i'v