ajaxToolkit中 Rating控件 自定义鼠标经过提示信息

<cc1:Rating ID="startRating" runat="server" CurrentRating="0" StarCssClass="RatingStar"
FilledStarCssClass="filledRatingStar" EmptyStarCssClass="emptyRatingStar" WaitingStarCssClass="savedRatingStar"
onmouseover="javascipt:changeStarTitle(this);">

<script type="text/javascript">
// 更改评星条的提示
function changeStarTitle(obj) {
var tdRate = obj.parentNode;
var subSpan = tdRate.getElementsByTagName("span");
for (var i = 0; i < subSpan.length; i++) {
switch (i) {
case 0: subSpan[i].title = "非常不满意"; break;
case 1: subSpan[i].title = "不满意"; break;
case 2: subSpan[i].title = "一般"; break;
case 3: subSpan[i].title = "满意"; break;
case 4: subSpan[i].title = "非常满意"; break;
default: break;
}
}
}
</script>