explorer collapse, PLEASE HELP ME!

explorer collapse, PLEASE HELP ME!

Hey,

I'm using FCKeditor WYSEWYG.
The FCKeditor use JavaScript code and until month

before I don't have problem using him.
But suddenly I'm getting annoying error from the

explorer, It's very hard to know why this error occur

but I think it's related to float menus.

For example When I'm open a float menu by right click

and I don't choose noting from this menu and I click

on the editor area I'm get the Explorer error that

collapse my Explorer.

It's seems like after the explorer work for some time

and then I'm doning that it's appear.

I only want to know why the explorer need to

collapse?! It's can be because JavaScript?! Because

the size of the JavaScript?! Why?

If it's help, in FireFox there is no error like that!

PLEASE HELP ME!