Add the following code to either your 'Smart Left SideBar' or 'Smart Right SideBar' layout (Design | Library | Layouts | Page Areas), in the position that you want it to appear:
Replace 'MY HEADING' and 'MY TEXT' with the relevant contents for the box. Alternatively, you could create variables for these items and enter the data in the appropriate field in the interface.
HTML Code:
<table cellpadding="0" cellspacing="0" border="0" width="100%"> <tr> <td valign="top" width="8%" bgcolor="<actinic:variable name="Palette2" />"><img src="theme_tab2_left.gif" /></td> <td bgcolor="<actinic:variable name="Palette2" />" width="84%" height="20"><span class="boxheading">MY HEADING</span></td> <td valign="top" width="8%" align="right" bgcolor="<actinic:variable name="Palette2" />"><img src="theme_tab2_right.gif" /></td> </tr> <tr> <td colspan="3" class="thinborder2"> <div style="padding: 2px"> MY TEXT </div> </td> </tr> </table>