Integrate FCKEditor in php page

hi every body,
it is my firet time to use fckEditor, i have folow all the step in the devloper's guid to integrate fckEditlor in my php page
but it dosen't work, i get those errror from Firebug (in FireFox).

FCKBrowserInfo is not defined
[Break on this error] if ( FCKBrowserInfo.IsGecko )

FCKLang is not defined
[Break on this error] window.document.dir = FCKLang.Dir

FCKPlugins is not defined
[Break on this error] FCKPlugins.Load()

FCKConfig_PreProcess is not defined
[Break on this error] FCKConfig_PreProcess() ;

FCKBrowserInfo is not defined
[Break on this error] if ( FCKBrowserInfo.IsIE )

thanks for you help
best regards