照片各部分的彩色与黑白交替更换

ul { width:300px; height:300px; margin:0px auto; padding:0px; overflow:hidden; background:transparent url(/study/2006_12_25/2006122516414543849.jpg)} li {list-style-type:none; width:100px; height:100px; float:left} li a { display:block; width:100px;