.fl{float:left}.fr{float:right}
.clear{clear:both}.cl{clear:left}.cr{clear:right}
.box,.pr{position:relative}.pa{position:absolute}
.box,.oh{overflow:hidden}.oa{overflow:auto}.ov{overflow:visible}
.box,.db{display:block}.di{display:inline}.dn{display:none}
.tal{text-align:left}.tac{text-align:center}.tar{text-align:right}
.z1{zoom:1}.zN{zoom:normal}