Another way to preload images in javascript

function preloadImg(url) {
var divPreLoad = '<div style="height:0px; width:1px; background-image:url(' + url + ')"></div>';
document.write(divPreLoad);
}

DataList with automatically generated columns

DataList can repeat, but can't autogenerate.
DetailsView can autogenerate, but can't repeat (but requires a list as datasource, thus the array)

      <asp:DataList ID="dvResults" runat="server" ondatabound="dvResults_DataBound">
          <ItemTemplate>
              <asp:DetailsView ID="subDvResult" runat="server" RowStyle-CssClass="row"
                  DataSource='<%# new System.Collections.Generic.List<System.Data.DataRowView>(new System.Data.DataRowView[]{(System.Data.DataRowView)Container.DataItem}) %>'>
              </asp:DetailsView>
          </ItemTemplate>
          <SeparatorTemplate>
              <br />
          </SeparatorTemplate>
      </asp:DataList>