.center{ margin:auto;}/*居中*/
.left{ float:left;}/*居左*/
.right{ float:right}/*居右*/
.inline{display:inline}/*块级元素转换为内联元素*/
.block{ display:block}/*内联元素转换为块级元素*/
.hidden{ overflow:hidden}/*益出隐藏*/
.auto{ overflow:auto}/*如果内容被修剪，则浏览器会显示滚动条以便查看其余的内容*/
.both{ clear:both}/*清处左右浮动*/
.clearleft{ clear:left}/*清处左浮动*/
.clearright{ clear:right}/*清处右浮动*/
.tcenter{ text-align:center}/*文字居中*/
.tleft{ text-align:left}/*文字居左*/
.tright{ text-align:right}/*文字居右*/
.ttop{ vertical-align:text-top}/*文字居顶*/
.tbottom{ vertical-align: text-bottom}/*文字居底*/
.dw{position:relative;} 
.fixed{ z-index:100; overflow:visible;  position:fixed; top:0;}
.yydx{ text-transform:uppercase;}

/*menu*/
ul,li{list-style:none; margin:0; padding:0;}
.menu{ width:1002px; height:43px;}
.menu li {float:left;}
.menu li a{ display:block;height:43px; line-height:0; font-size:0; overflow:hidden; }
.m1,a.m1:link,a.m1:visited{ width:142px; background:url(../images/dh.jpg) no-repeat 0 0px;}
a.m1:hover,a.m1:active{background:url(../images/dh.jpg) no-repeat -0px -43px;}
.m2,a.m2:link,a.m2:visited{ width:118px; background:url(../images/dh.jpg) no-repeat -142px -0px;}
a.m2:hover,a.m2:active{background:url(../images/dh.jpg) no-repeat -142px -43px;}
.m3,a.m3:link,a.m3:visited{ width:116px; background:url(../images/dh.jpg) no-repeat -260px -0px;}
a.m3:hover,a.m3:active{background:url(../images/dh.jpg) no-repeat -260px -43px;}
.m4,a.m4:link,a.m4:visited{ width:116px; background:url(../images/dh.jpg) no-repeat -376px -0px;}
a.m4:hover,a.m4:active{background:url(../images/dh.jpg) no-repeat -376px -43px;}
.m5,a.m5:link,a.m5:visited{ width:114px; background:url(../images/dh.jpg) no-repeat -492px -0px;}
a.m5:hover,a.m5:active{background:url(../images/dh.jpg) no-repeat -492px -43px;}
.m6,a.m6:link,a.m6:visited{ width:114px; background:url(../images/dh.jpg) no-repeat -606px -0px;}
a.m6:hover,a.m6:active{background:url(../images/dh.jpg) no-repeat -606px -43px;}
.m7,a.m7:link,a.m7:visited{ width:116px; background:url(../images/dh.jpg) no-repeat -720px -0px;}
a.m7:hover,a.m7:active{background:url(../images/dh.jpg) no-repeat -720px -43px;}
.m8,a.m8:link,a.m8:visited{ width:166px; background:url(../images/dh.jpg) no-repeat -836px -0px;}
a.m8:hover,a.m8:active{background:url(../images/dh.jpg) no-repeat -836px -43px;}
/*end menu*/