.menu_left {
	float:left;
	width:163px;
	background-color:#4974b5;
	margin-left:auto;
	margin-right:auto;
}
.menu_right {
	float:right;
	width:163px;
	background-color:#4974b5;
	margin-left:auto;
	margin-right:auto;
}
.m_banner_hide{
        display:none;
}
.m_banner_show{
        display:block;
}
.d_banner_show{
        display:block;
}