A {
	COLOR: #22ac38; TEXT-DECORATION: none
}
A:hover {
	COLOR: red; TEXT-DECORATION: underline
}
.menu {
	MARGIN: auto auto 1px;
	LINE-HEIGHT: 42px;
	HEIGHT: 45px;
	TEXT-ALIGN: center;
	padding: 3px 0px 3px 0px;
	width:100px
}

.menu A {
	margin-left:30px; font-size:13px;
	PADDING-RIGHT: 1px; DISPLAY: block; PADDING-LEFT: 30px; FLOAT: left; PADDING-BOTTOM: 0px; COLOR:#7EB5DC; PADDING-TOP: 0px
}
.menu A:hover {
	COLOR: #f39800
}
.menu .select {
	PADDING-RIGHT: 15px; 
}
DIV.menu {

}
DIV.menu-list {
	BORDER-RIGHT: #d6d6d6 0px solid; PADDING-RIGHT: 0px; BORDER-TOP: #d6d6d6 0px solid; DISPLAY: none; PADDING-LEFT: 0px; BACKGROUND:#E2F2FE; FILTER: alpha(opacity=80); PADDING-BOTTOM: 5px; BORDER-LEFT: #d6d6d6 1px solid; WIDTH: 100px; PADDING-TOP: 0px; BORDER-BOTTOM: #d6d6d6 0px solid; POSITION: absolute; opacity: 0.6
}

DIV.menu-list UL {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px;display:inline
}
DIV.menu-list UL LI {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px
}
DIV.menu-list UL LI {
	MARGIN: 5px 5px 0px; LIST-STYLE-TYPE: none
}
DIV.menu-list UL LI A {
	DISPLAY: block; WIDTH: 100%; CURSOR: pointer; COLOR: #000; LINE-HEIGHT: 25px; HEIGHT: 25px; TEXT-ALIGN: center; TEXT-DECORATION: none
}
DIV.menu-list UL LI A SPAN {
	DISPLAY: block; WIDTH: 100%; HEIGHT: 100%
}
DIV.menu-list UL LI A:hover {
	BACKGROUND: url(http://www.sibotech.net/images/bg-left.jpg) #5d98d4 no-repeat 0px 0px; COLOR: #fff
}
DIV.menu-list UL LI A:hover SPAN {
	BACKGROUND: url(http://www.sibotech.net/images/bg-right.jpg) no-repeat right top
}



/* 首页*/
A {
	COLOR: #3366CC; TEXT-DECORATION: none
}
A:hover {
	COLOR: red; TEXT-DECORATION: underline
}
.indexmenu {
	MARGIN: auto auto 1px;
	LINE-HEIGHT: 42px;
	HEIGHT: 45px;
	TEXT-ALIGN: center;
}
.indexmenu A ,.indexmenu A:hover{
	margin-left:22px; font-size:16px;
	PADDING-RIGHT: 22px; DISPLAY: block; PADDING-LEFT: 20px; FLOAT: left; PADDING-BOTTOM: 0px; COLOR:#7EB5DC; PADDING-TOP: 0px
}
.indexmenu A:hover {
	COLOR: #f39800
}
.indexmenu .select {
	PADDING-RIGHT: 15px; 
}
DIV.indexmenu {

}
DIV.indexmenu-list {
	BORDER-RIGHT: #d6d6d6 0px solid; PADDING-RIGHT: 0px; BORDER-TOP: #d6d6d6 0px solid; DISPLAY: none; PADDING-LEFT: 0px; BACKGROUND:#E2F2FE; FILTER: alpha(opacity=80); PADDING-BOTTOM: 5px; BORDER-LEFT: #d6d6d6 1px solid; WIDTH: 140px; PADDING-TOP: 0px; BORDER-BOTTOM: #d6d6d6 0px solid; POSITION: absolute; opacity: 0.6;
	
}
DIV.indexmenu-list UL {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px;
	float:left 
}
DIV.indexmenu-list UL LI {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px
}
DIV.indexmenu-list UL LI {
	MARGIN: 5px 5px 0px; LIST-STYLE-TYPE: none
}
DIV.indexmenu-list UL LI A, DIV.indexmenu-list UL LI A:hover {
	DISPLAY: block; WIDTH: 100%; CURSOR: pointer; COLOR: #000; LINE-HEIGHT: 25px; HEIGHT: 25px; TEXT-ALIGN: center; TEXT-DECORATION: none;
	
}
DIV.indexmenu-list UL LI A strong{
font-size:12px}
DIV.indexmenu-list UL LI A SPAN, DIV.indexmenu-list UL LI A:hover SPAN {
	DISPLAY: block; WIDTH: 100%; HEIGHT: 100%
}


* {
margin:0;
padding:0;
}
.gnav {
font-size:16px;

}
.gnav li {/*水平菜单*/
float:left;
list-style:none;
position:relative;/*把包含块移动li元素*/
}
.gnav a {
display:block;
height:32px;
width:150px;
line-height:32px;
background:#EDF1F8;
color:#7EB5DC;
text-decoration:none;
text-align:center;
overflow:hidden;/*★★★★*/
}
.shi1 a{
display:block;
height:32px;
width:135px;
line-height:32px;
background:#EDF1F8;
color:#7EB5DC;
text-decoration:none;
text-align:center;
overflow:hidden;/*★★★★*/
}
.shi2 a{
display:block;
height:32px;
width:140px;
line-height:32px;
background:#EDF1F8;
color:#7EB5DC;
text-decoration:none;
text-align:center;
overflow:hidden;/*★★★★*/
}
.gnav a:hover {
background:#369;
color:#f39800;
}
/*新增的二级菜单部分*/
.gnav ul ul {
visibility:hidden;/*隐藏所有子菜单（二级的三级）*/
position:absolute;
left:0px;
top:32px;
}
/*指定是显示二级子菜单*/
.gnav ul li:hover ul.second,/*非IE6*/
.gnav ul a:hover ul.second{/*IE6*/
visibility:visible;
font-size:13px
}
.gnav ul ul li {
clear:both;/*垂直显示*/
text-align:left;
width:200px;
}
.gnav .third,.gnav .fourth{
top:0px;/*重设子菜单相对于包含块哪个位置出现*/
left:100px;
}
/*指定是显示三级子菜单*/
.gnav ul ul li:hover ul.third,
.gnav ul ul a:hover ul.third{
visibility:visible;
}
/*指定是显示三级子菜单*/
.gnav ul ul ul li:hover ul.fourth,
.gnav ul ul ul a:hover ul.fourth{
visibility:visible;
}
/*重设子菜单在鼠标滑过时的样式，有多少个ul就表明当前是多少级子菜单*/
/*二级子菜单*/
.gnav ul ul a:hover{
background:369;
color:white;
}
/*三级子菜单*/
.gnav ul ul ul a:hover{
background:#B45B3E;
color:white;
}
.gnav ul ul ul ul a:hover{
background:#FFE8AA;
color:#68DFFB;
}
<!--[if lte IE 6]>
.gnav table {
border:0px solid aqua;
}
.gnav table td{
border:0px solid aqua;
}

<!--![endif]-->