Further to that.
I fI right click on a red cross and get the path to the image, and then paste that into a browser address bar, the image displays properly.
Eg the img tag is as follows :
<img id="cmd_TableDropDown" Command="TableDropDown" onclick="var editor=CuteEditor_GetEditor(this);if(!editor.readOnly)editor.TableDropDown(this)" class="CuteEditorButton" src="/ContactWeb/CuteSoft_Client/CuteEditor/Themes/OfficeXP/Images/instable.gif.aspx" title="Insert Table" />
The link to the image file is ok.
James