.menu{ float:left; text-transform:uppercase;}
.menu ul {float:right;}
.menu ul, .menu_right ul {padding:0px; margin:0px;}
.menu ul li, .menu_right ul li{display:inline; float:left; text-align:center; }



/* remove all the bullets, borders and padding from the default list styling */
.menu ul {
padding:0;
margin:0;
list-style-type:none;
}
.menu ul ul {
width:134px;
}
/* float the list to make it horizontal and a relative positon so that you can control the dropdown menu positon */
.menu li {
float:left;
width:134px;
position:relative;
}

/* style the links for the top level */
.menu a, .menu a:visited {
display:block;
/*font-size:14px;
font-family:Arial, Helvetica, sans-serif;
text-decoration:none; 
color:#fff;*/
width:134px; 
height:22px; 
/*background:#758279; */
padding-left:10px; 
line-height:22px;
/*background-image: url(../images/m_p_1.gif);*/
/*color:#ffffff;*/
background-repeat: no-repeat;
}
/* a hack so that IE5.5 faulty box model is corrected  根部菜单宽度*/
* html .menu a, * html .menu a:visited {
width:134pxpx;
w\idth:134pxpx;
}

/* style the second level background */
.menu ul ul a.drop, .menu ul ul a.drop:visited {
background:#949e7c;
}
/* style the second level hover */
.menu ul ul a.drop:hover{
background:#c9ba65;
}
.menu ul ul :hover > a.drop {
background:#c9ba65;
}
/* style the third level background */
.menu ul ul ul a, .menu ul ul ul a:visited {
background:#e2dfa8;
}
/* style the third level hover */
.menu ul ul ul a:hover {
background:#b2ab9b;
}
.menu ul ul ul :hover > a {
background:#b2ab9b;
}

/* hide the sub levels and give them a positon absolute so that they take up no room */
.menu ul ul {
display:none;
position:absolute;
width:134px;
top:23px;
left:0; 
z-index:0;
}

/* Hack IE 8 only */
/*\*//*/ .menu ul ul {
top: 0px;
}/* */


/* position the third level flyout menu */
.menu ul ul ul{
left:134px; 
top:0;
width:134px;
}
/* position the third level flyout menu for a left flyout */
.menu ul ul ul.left {
left:-134px;
}

/* style the table so that it takes no part in the layout - required for IE to work */
.menu table {position:absolute; top:0; left:0;}

/* style the second level links 下拉菜单-一级*/
.menu ul ul a, .menu ul ul a:visited {
background:#FFFFFF; 
color:#000; 
height:auto; 
line-height:1em; 
padding:10px 10px 10px 10px; 
width:134px;
/* yet another hack for IE5.5 */
}
* html .menu ul ul a{
width:134px;
w\idth:134px;
}


/* style the top level hover */
.menu a:hover, .menu ul ul a:hover{
color:#fff; 
background:#004998;
}
.menu :hover > a, .menu ul ul :hover > a {
color:#fff;

}

/* make the second level visible when hover on first level list OR link */
.menu ul li:hover ul,
.menu ul a:hover ul,
.menu ul li:hover ul li{
display:block; 
}
/* keep the third level hidden when you hover on first level list OR link */
.menu ul :hover ul ul{
display:none; 
}
/* keep the fourth level hidden when you hover on second level list OR link */
.menu ul :hover ul :hover ul ul{
display:none; 
}
/* make the third level visible when you hover over second level list OR link */
.menu ul :hover ul :hover ul{ 
display:block;
}
/* make the fourth level visible when you hover over third level list OR link */
.menu ul :hover ul :hover ul :hover ul { 
display:block;
}

<!--首层菜单背景开始-->
.menu ul li a.r_1, .menu ul li a.r_1:visited {
	background-image: url(../images/m_p_1.gif);
	color:#ffffff;
	font-size:18px;
}
.menu ul li a.r_1:hover{
	background-image: url(../images/m_p_1_o.gif);
	background-repeat: no-repeat;
    color:#FFFFFF;
	font-size:18px;
}
.menu ul li :hover > a.r_1 {
	color:#FFFFFF;
	background-image: url(../images/m_p_1_o.gif);
	background-repeat: no-repeat;
	font-size:18px;
}

.menu ul li a.r_2, .menu ul li a.r_2:visited {
	background-image: url(../images/m_p_1.gif);
	color:#ffffff;
	background-position: -191px;
	font-size:18px;
}
.menu ul li a.r_2:hover{
	background-image: url(../images/m_p_1_o.gif);
    color:#FFFFFF;
	background-position: -191px;
	font-size:18px;
}
.menu ul li :hover > a.r_2 {
	color:#FFFFFF;
	background-image: url(../images/m_p_1_o.gif);
	background-position: -191px;
	font-size:18px;

}

.menu ul li a.r_3, .menu ul li a.r_3:visited {
	background-image: url(../images/m_p_1.gif);
	color:#ffffff;
	background-position: -382px;
	font-size:18px;
}
.menu ul li a.r_3:hover{
	background-image: url(../images/m_p_1_o.gif);
    color:#FFFFFF;
	background-position: -382px;
	font-size:18px;
}
.menu ul li :hover > a.r_3 {
	color:#FFFFFF;
	background-image: url(../images/m_p_1_o.gif);
	background-position: -382px;
	font-size:18px;

}

.menu ul li a.r_4, .menu ul li a.r_4:visited {
	background-image: url(../images/m_p_1.gif);
	color:#ffffff;
	background-position: -573px;
	font-size:18px;
}
.menu ul li a.r_4:hover{
	background-image: url(../images/m_p_1_o.gif);
    color:#FFFFFF;
	background-position: -573px;
	font-size:18px;
}
.menu ul li :hover > a.r_4 {
	color:#FFFFFF;
	background-image: url(../images/m_p_1_o.gif);
	background-position: -573px;
	font-size:18px;

}

.menu ul li a.r_5, .menu ul li a.r_5:visited {
	background-image: url(../images/m_p_1.gif);
	color:#ffffff;
	background-position: -764px;
	font-size:18px;
}
.menu ul li a.r_5:hover{
	background-image: url(../images/m_p_1_o.gif);
    color:#FFFFFF;
	background-position: -764px;
	font-size:18px;
}
.menu ul li :hover > a.r_5 {
	color:#FFFFFF;
	background-image: url(../images/m_p_1_o.gif);
	background-position: -764px;
	font-size:18px;

}

.menu ul li a.r_6, .menu ul li a.r_6:visited {
	background-image: url(../images/m_p_1.gif);
	color:#ffffff;
	background-position: -955px;
	font-size:18px;
}
.menu ul li a.r_6:hover{
	background-image: url(../images/m_p_1_o.gif);
    color:#FFFFFF;
	background-position: -955px;
	font-size:18px;
}
.menu ul li :hover > a.r_6 {
	color:#FFFFFF;
	background-image: url(../images/m_p_1_o.gif);
	background-position: -955px;
	font-size:18px;

}
<!--首层菜单背景结束-->


<!--二级下拉菜单背景开始-->
.menu ul li a.m_1, .menu ul li a.m_1:visited {
background:#ffffff;
color:#fcca00;
}
.menu ul li a.m_1:hover{
background:#fcca00;
color:#FFFFFF;
}
.menu ul li :hover > a.m_1 {
background:#fcca00;
color:#FFFFFF;
}

.menu ul li a.m_1_1, .menu ul li a.m_1_1:visited {
background:#fcca00;
color:#ffffff;
}
.menu ul li a.m_1_1:hover{
background:#e1b502;
color:#FFFFFF;
}
.menu ul li :hover > a.m_1_1 {
background:#e1b502;
color:#FFFFFF;
}


.menu ul li a.m_2, .menu ul li a.m_2:visited {
background:#ffffff;
color:#00a0e8;
}
.menu ul li a.m_2:hover{
background:#00a0e8;
color:#FFFFFF;
}
.menu ul li :hover > a.m_2 {
background:#00a0e8;
color:#FFFFFF;
}

.menu ul li a.m_2_1, .menu ul li a.m_2_1:visited {
background:#00a0e9;
color:#ffffff;
}
.menu ul li a.m_2_1:hover{
background:#0686c1;
color:#FFFFFF;
}
.menu ul li :hover > a.m_2_1 {
background:#0686c1;
color:#FFFFFF;
}

.menu ul li a.m_3, .menu ul li a.m_3:visited {
background:#ffffff;
color:#e50012;
}
.menu ul li a.m_3:hover{
background:#e50012;
color:#FFFFFF;
}
.menu ul li :hover > a.m_3 {
background:#e50012;
color:#FFFFFF;
}

.menu ul li a.m_3_1, .menu ul li a.m_3_1:visited {
background:#e60012;
color:#ffffff;
}
.menu ul li a.m_3_1:hover{
background:#c40413;
color:#FFFFFF;
}
.menu ul li :hover > a.m_3_1 {
background:#c40413;
color:#FFFFFF;
}

.menu ul li a.m_4, .menu ul li a.m_4:visited {
background:#ffffff;
color:#ae7322;
}
.menu ul li a.m_4:hover{
background:#ae7322;
color:#FFFFFF;
}
.menu ul li :hover > a.m_4 {
background:#ae7322;
color:#FFFFFF;
}

.menu ul li a.m_4_1, .menu ul li a.m_4_1:visited {
background:#ae7322;
color:#ffffff;
}
.menu ul li a.m_4_1:hover{
background:#8d5c18;
color:#FFFFFF;
}
.menu ul li :hover > a.m_4_1 {
background:#8d5c18;
color:#FFFFFF;
}

.menu ul li a.m_6, .menu ul li a.m_6:visited {
background:#FFFFFF;
color:#920783;
}
.menu ul li a.m_6:hover{
background:#920783;
color:#FFFFFF;
}
.menu ul li :hover > a.m_6 {
background:#920783;
color:#FFFFFF;
}

<!--二级下拉菜单背景结束-->