CSS problems reported by Firefox

Hi,

I've upgraded from 2.4.3 to 2.5.1 and now get these errors reported by Firefox on a Windows Vista machine. On the same machine with IE 7, FCK doesn't work anymore. On a Windows XP machine with both Firefox and IE 7 and do not have problems.

Warning: Error in parsing value for property 'top'. Declaration dropped.
Source File: http://www.abc.com/abc/editEvent.do
Line: 0

Warning: Error in parsing value for property 'left'. Declaration dropped.
Source File: http://www.abc.com/abc/editEvent.do
Line: 0

Warning: Error in parsing value for property 'top'. Declaration dropped.
Source File: http://www.abc.com/abc/editEvent.do
Line: 0

Warning: Error in parsing value for property 'left'. Declaration dropped.
Source File: http://www.abc.com/abc/editEvent.do
Line: 0

Warning: Error in parsing value for property 'display'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 71

Warning: Unknown property 'filter'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 153

Warning: Unknown property 'filter'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 159

Warning: Unknown property 'filter'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 262

Warning: Unknown property 'filter'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 279

Warning: Unknown property 'text-overflow'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 352

Warning: Unknown property 'filter'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 387

Warning: Unknown property 'text-overflow'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 399

Warning: Unknown property 'filter'. Declaration dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 415

Warning: Error in parsing value for property 'display'. Declaration
dropped.
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... editor.css
Line: 71

Error: FCKStyles is not defined
Source File:
http://www.abc.com/abc/js/FCKeditor/edi ... oolbar=abc
Line: 80