วิธีทำ mouseover ทำยังครับ อยากให้เปลี่ยนสีแถวของตารางตาม mouse อ่ะครับ

<table id="datatable" style="border: 1px outset #000000">
                        <asp:Repeater ID="rp" runat="server" OnItemDataBound="rowdatabound">
                            <HeaderTemplate >
                                <tr style="background-color: #3399FF" runat="server" >
                                    <th runat="server" >
                                        <asp:CheckBox ID="cball" runat="server" AutoPostBack="True" OnCheckedChanged="cball_check"/>
                                    </th>
                                    <th runat="server" >
                                        Line No.
                                    </th>
                                    <th runat="server" >
                                        Line Name
                                    </th>
                                    <th runat="server" >
                                    </th>
                                    <th runat="server" >
                                        Part No.
                                    </th>
                                    <th runat="server" >
                                        Part Name
                                    </th>
                                </tr>
                            </HeaderTemplate>
                            <ItemTemplate >
                                <tr id="ritem" style="font-size: smaller;" onmouseover="style.background-color='#99CCFF';" onmouseout="style.background-color='#FFFFFF';">
                                    <td id="ccbl">
                                        <asp:CheckBox ID="cbl" runat="server" />
                                    </td>
                                    <td id="clno" >
                                        <asp:Label ID="lineno" runat="server" Text=""></asp:Label>
                                    </td>
                                    <td id="clname" >
                                        <asp:Label ID="linename" runat="server" Text="Label"></asp:Label>
                                    </td>
                                    <td id="ccbp" >
                                        <asp:CheckBox ID="cbp" runat="server" />
                                    </td>
                                    <td id="cpno" >
                                        <asp:Label ID="partno" runat="server" Text="Label"></asp:Label> 
                                    </td>
                                    <td id="cpname" >
                                        <asp:Label ID="partname" runat="server" Text="Label"></asp:Label>
                                    </td>
                                </tr>
                            </ItemTemplate>
                        </asp:Repeater>
                    </table>