I have set the EditorWysiwygModeCss value to point to a stylesheet file. I know it is connected properly because "most" of the styles work. However, table backgrounds do not appear as they would on an html page (they are white). Here is the stylesheet code:
/*----Table styles--*/
thead {text-align:center; background-color:#d3d3d3; font-size:10pt; font-weight:bold; color:#000000}
tbody {text-align:left; background-color:#f5f5f5; color:#224474}
tfoot {text-align:center; background-color:#d3d3d3; font-size:10pt; font-weight:bold; color:#000000}
When the code is displayed within the editor, all tables have a white background. When I place the code on a page along with the reference to the same stylesheet, the table backgrounds are displayed.
P.S. previous posting on table background images was never answered. It may or may not be related to this issue, and may be related to an IE bug. This (above) definition works fine in IE, but not the editor.