如何更改地標mouse on訊息視窗的style?

CSS

/** MouseOnDiv 區塊 **/
.UMarkerMouseOnDiv{
	position: absolute;
	top:0px;
	width:120px;
	z-index:1;
	font:12px tahoma;
	display:none;
	overflow:hidden;
	opacity:0.8;
	filter:alpha(opacity:80);
	border: 1px solid #0099FF;
}
/** MouseOnDiv 標題 **/
.UMarkerMouseOnDivName{
	font-size: 13px;
	font-weight: bold;
	color: #FFFFFF;
	background-image: url(UMarkerTop.gif);
	background-repeat: repeat-x;
	background-position: left bottom;
	background-color: #0f69fe;
	border: 1px solid #FFFFFF;
	padding-top: 1px;
	padding-right: 3px;
	padding-bottom: 5px;
	padding-left: 3px;
}
/** MouseOnDiv 內容 **/
.UMarkerMouseOnDivDesc{
	padding:1px 10px;
	background-color:#FFFFFF;
}