网页元素定位动态变换问题_html/css_WEB-ITnose
html css Javascript 元素定位 网页布局
雅虎首页（yahoo.com),当向下浏览页面，页面左侧和右侧的内容已经到底，而中间仍有内容时，中间内容还可以继续向下滑动，左侧和右侧都停留在各自的最低端（如图一左、右侧），而不会显示空白（如图二右侧）。回复讨论(解决方案)
js获取页面滚动的高度，当滚动高度和浏览器窗口高度大于左侧的文档高度时，将左侧需要悬浮的部分改为position:fixed，IE6下用position:absolute模拟fixed。
右侧同理。
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