banner = new Array(32);
banner[0]  = 'yzman/a1.gif' 
banner[1]  = 'yzman/a3.jpg'
banner[2]  = 'yzman/a3.jpg'
banner[3]  = 'yzman/a4.jpg'
banner[4]  = 'yzman/a5.jpg'
banner[5]  = 'yzman/a6.jpg'
banner[6]  = 'yzman/a3.gif'
banner[7]  = 'yzman/a8.jpg'
banner[8]  = 'yzman/a9.jpg'
banner[9]  = 'yzman/a3.jpg'
banner[10]  = 'yzman/huxuehui.jpg' 
banner[11]  = 'yzman/lihongning.jpg'
banner[12]  = 'yzman/liushugui.jpg'
banner[13]  = 'yzman/weworking.jpg'
banner[14]  = 'yzman/weworking.jpg'//
banner[15]  = 'yzman/weworking.jpg'//
banner[16]  = 'yzman/weworking.jpg'//
banner[17]  = 'yzman/sunyanlong.jpg'
banner[18]  = 'yzman/weworking.jpg'  //
banner[19]  = 'yzman/wangliyuan.jpg'
banner[20]  = 'yzman/weworking.jpg'  //
banner[21]  = 'yzman/wemeeting.jpg'
banner[22]  = 'yzman/wenning.jpg'
banner[23]  = 'yzman/wenning1.jpg'
banner[24]  = 'yzman/weworking.jpg'
banner[25]  = 'yzman/weworking2.jpg'
banner[26]  = 'yzman/wujianwu1.jpg'
banner[27]  = 'yzman/wujianwu2.jpg'
banner[28]  = 'yzman/yangxiaokun.jpg'
banner[29]  = 'yzman/yufeng.jpg'
banner[30]  = 'yzman/zhanqian1.jpg'
banner[31]  = 'yzman/zhaosong.jpg'
index = Math.floor(Math.random() * banner.length);
document.write('<IMG SRC=images/'+banner[index]+' border=0 width=640 height=140>');