2.1.1 doesn't work with IE !!!

Hello,
I have installed fckeditor version 2.1.1 (php), but it does'nt work with Internet Explorer, but work with Firefox....

i don't have the toolbar with IE and i have a javascript error :

Line : 47
Car : 1327
Error : 'length' à la valeur Null ou n'est pas un objet
Code : 0
URL : pathtofckeditor/fckeditor.html?..........

thanks for your help !

Slump