FCKEditor not worked at all on firefox3.0 or ie8.0, there ar

I used the fckeditor 2.6.41 on my project but it doesnot work well on firefox3.0 or ie8.0, there are some javascript errors, see following:

syntax error
[Break on this error] ??*\n
fckedito..._gecko.js ()
syntax error
[Break on this error] ??*\n
fckconfig.js (1)
FCKBrowserInfo is not defined
[Break on this error] if ( FCKBrowserInfo.IsGecko && !FCKBrowserInfo.IsOpera )
fckedito...r=Default (270)
FCKConfig_LoadPageConfig is not defined
[Break on this error] FCKConfig_LoadPageConfig() ;
fckedito...r=Default (164 )
FCKTools is not defined
[Break on this error] var FCK_InternalCSS = FCKTools.FixCssU...und-image:url(images/block_h6.png)}' ) ;
fckedito...r=Default ( 176 )
FCK_ContextMenu_Init is not defined
[Break on this error] FCK_ContextMenu_Init() ;
fckedito...r=Default (195 )
FCKLang is not defined
[Break on this error] window.document.dir = FCKLang.Dir ;
fckedito...r=Default ( 203 )
InitializeAPI is not defined
[Break on this error] InitializeAPI() ;


but the I am confused why it works well on a normal tomcat (not like the one I used), is it the reason that charset issue? or other something ?
please help...