<table id="Table_01" width="790" height="23" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <asp:Repeater ID="ImageButtonList" runat="server">
      <ItemTemplate>
        <td>
          <asp:ImageButton runat="server" id="lame" oncommand="btn_Command" CommandName='<%# Container.DataItem + ".aspx" %>'
          ImageUrl="<%# setButtonImageUrl((String) Container.DataItem,0) %>"
          onMouseOver="<%# setButtonImageUrl((String) Container.DataItem,1) %>"
          onMouseOut="<%# setButtonImageUrl((String) Container.DataItem,2) %>"
          />
          </td>
          <td>
            <img src="images/top_menu/top_menu_div.gif" width="2" height="23" alt="" />
          </td>
      </ItemTemplate>
    </asp:Repeater>
  </tr>
</table>

    protected string setButtonImageUrl(string page, int mouseAction)
    {
      string thispage = HttpContext.Current.Request.CurrentExecutionFilePath;
      thispage = System.IO.Path.GetFileName(thispage);

      string folder = ContentFlowState.GetCurrentProgramFolder();
      if (!string.IsNullOrEmpty(folder))
        folder = "/" + folder;

      string imagePath = "~/images" + folder + "/top_menu/";

       if (thispage.Equals(page + ".aspx", StringComparison.InvariantCultureIgnoreCase))
         return imagePath + page + "_over.gif";
       else
       {
         if (mouseAction == 1)
           return "this.src='" + Page.ResolveUrl(imagePath + page + "_over.gif") + "';";
         else if (mouseAction == 2)
           return "this.src='" + Page.ResolveUrl(imagePath + page + ".gif") + "';";
         else
           return imagePath + page + ".gif";
       }
    }