how to add alt row color to table repeater rows

Hi,
I am trying to figure out how to add alt row color to a table of repeaters. Any help is appreciated. Thanks..
<asp:Repeater ID="repSearchCycle" runat="server" ItemType="OFAC.FOIA.BusinessEntities.NHObjects.TIME_ENTRY" OnItemCommand="repSearchCycle_ItemCommand"> <ItemTemplate> <tr> <td class="repeatertabledata" align="center"> <asp:ImageButton id="imgbSearchView" runat="server" CommandName="View" CommandArgument='<%# Item.TIME_ENTRY_UID %>' CausesValidation="False" ToolTip="View" ImageUrl="~/Images/view.gif" > </asp:ImageButton> </td> <td class="repeatertabledata" align="center"> <asp:ImageButton id="imgbSearchEdit" runat="server&q ...