javascript多层次操作对象

Question

想在javascript里面对MSChart组件进行操作，如下面代码，
....表示省图了的属性，只想在<Points></Points>中添加<asp:DataPoint .....>--------------------------------------
 <asp:Chart ID="Chart1" runat="server"  ....>
<Legends>
<asp:Legend TitleFont="Microsoft Sans Serif, 8pt,  ....>
</asp:Legend>
</Legends>
<BorderSkin SkinStyle="Emboss"></BorderSkin>
<Series>
<asp:Series ChartArea="Area1" XValueType="Double" Name="Series1" ChartType="Pie" ....">
<Points>
<asp:DataPoint LegendText="RUS" CustomProperties="OriginalPointIndex=0" YValues="39" />

</Points>
</asp:Series>
</Series>
</asp:Chart>