Forms Data Controls :: Repeater Add Before Every 1st Item, Adding After Every 2nd Item?

I have a repeater control:

<asp:Repeater ID="rep" DataSourceID="XMLDSCompare" runat="server">
<ItemTemplate>
<h4><%# XPath("title")%></h4>
</ItemTemplate>
</asp:Repeater>

Now if its the first item in the total resultset, I want to add <div> to ItemTemplate control, if its the 2nd item, I want to add </div>

So output would be (not including table tags generated by repeater control):

<div>
title 1
title 2
</div>
<div>
title 3
title 4
</div>
<div>
title 5
title 6
</div>

How would I do this in the ItemDataBound event of repeater control?