建立了一个HTML文件，里面部分用css来控制的，在DW里可以正常显示，但是在预览就不显示了，css样式的

样式表是这样写的：
.2jiyemian_dibubeijing {
background-image: url(2%E5%8F%8A%E9%A1%B5%E9%9D%A2%E5%9B%BE%E7%89%87/2%E7%BA%A7%E9%A1%B5%E9%9D%A2_r13_c1.jpg);
background-repeat: repeat-x;
}
.2jiyemian_youbian_beijing {
background-image: url(2%E5%8F%8A%E9%A1%B5%E9%9D%A2%E5%9B%BE%E7%89%87/2%E7%BA%A7%E9%A1%B5%E9%9D%A2_r1_c18.jpg);
background-repeat: repeat-x;
}
.2jiyemian_dingbu_beijing {
background-image: url(2%E5%8F%8A%E9%A1%B5%E9%9D%A2%E5%9B%BE%E7%89%87/2%E7%BA%A7%E9%A1%B5%E9%9D%A2_r1_c9.jpg);
background-repeat: repeat-y;
}
.2jiyemian_biaoti_diwen {
background-image: url(2%E5%8F%8A%E9%A1%B5%E9%9D%A2%E5%9B%BE%E7%89%87/2%E7%BA%A7%E9%A1%B5%E9%9D%A2_r9_c8.jpg);
font-size: 24px;
font-weight: bold;
color: #436DA7;
}
.2jiyemian_biaoti2 {
background-image: url(2%E5%8F%8A%E9%A1%B5%E9%9D%A2%E5%9B%BE%E7%89%87/2%E7%BA%A7%E9%A1%B5%E9%9D%A2_r9_c3.jpg);
text-align: center;
color: #FFF;
font-weight: bold;
font-size: 18px;
font-family: "宋体";
}
.2jiyemian_dianhua {
background-image: url(2%E5%8F%8A%E9%A1%B5%E9%9D%A2%E5%9B%BE%E7%89%87/2%E7%BA%A7%E9%A1%B5%E9%9D%A2_r12_c4.jpg);
}