Script Summary: Float Google's left bar for your convenience. | 将Google左侧导航栏浮动起来。
Version: 1.2g
Simple as it is.
Google's left navigation bar will float on the left, no matter where you scroll to.
In addition, when the left navigation bar is higher than your window, you still can scroll the bar to your ease.
You scroll the left bar too much? Just scroll on the page center and the left bar will return to its default position.
安装后左侧导航栏将会浮动起来，怎么滚动都能在左边显示。
如果导航栏比你的窗口要高的话，你只要在导航栏上滚动，显示不出来的部分就会随滚动出来了。
一旦你滚动导航栏过了头了怎么办？很简单，在页面中心滚动一下，导航栏就会回到其默认位置了。
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2010.11.19 Version 1.2: All old code abandoned, now becomes just a floater. | 放弃所有其他代码，专心致志做导航栏浮动功能。
2010.11.26 Version 1.2a: code refinement. | 代码改善。
Version 1.2b: bypass floating left bar in Image Search, scrolling left bar is still available. | 在“图片搜索”中不浮动左侧导航栏，但仍可以滚动左侧导航栏。
Version 1.2c: Now support Google in other countries; fix a bug in Image Search left bar scrolling. | 添加其他国家版本Google的支持；修正在“图片搜索”中滚动导航栏的问题。
2010.12.02 Version 1.2d: Well...I forgot to comment out a debug code. | 不小心忘了要将一行调试代码注释掉了。
2011.04.22 Version 1.2e: Truly bypass floating left bar in Image Search, scrolling left bar is still available. | 在“图片搜索”中真正不浮动左侧导航栏，但仍可以滚动左侧导航栏。
2011.07.15 Version 1.2f: Change to fit the new Google sytle. | 更新以适应新Google样式。
2012.01.15 Version 1.2g: Advised by fromeast, change left bar background to transparent. | 根据 fromeast 的建议把导航栏改成背景透明。
