var d = document,
　　dd = d.documentElement,
　　db = d.body,
　　dc = d.compatMode == 'CSS1Compat',
　　dx = dc ? dd: db;

cWidth = dx.clientWidth;

cHeight = dx.clientHeight;

sWidth = dx.scrollWidth;

sHeight = dx.scrollHeight;

sLeft = dx.scrollLeft;

sTop = dx.scrollTop;