Designmode problems with resize handles

Hi,
I try to create a new user interface for a web CMS. My idea is to have
the complete page as "editable area", with selectable and unselectable
elements inside it. To create a cross-browser solution, I'm using the
designmode approach... loading the whole page in an iframe and using
an html-editor to work on ist.

Unfortunately, there are some problems, I could not solve until now.
If "designmode" ist activated, tables and images get "resize handles"
and I can't find a way to hide ore deactivate them. I tried to use CSS
with "-moz-user-select: none", then the handles disappear, but this
turns the whole element to be unselectable with all its children.It
can't be overridden by a child element - so it's impossible to have a
single "td" selectable inside a "table" unselectable. (For images moz-
user-select works fine.)

This is a very urgend problem, and it seems I can't go on with my
project without a control over this behaviour. It is confusing for a
user, if he can destroy the pagelayout using this handles.

So: how to remove the handles?
Does anybody knows a simple way to control the selection-behavior of
elements in designmode?

Here are some other designmode topics, I tried to find a solution:
- Form-elements are deactivated
- "onclick", "onmouseover" ... are not working (but you can use
addEventListener)
- Links are always underlined and blue

If anybody has some knowledge about this, I would be glad.
Thanks.