FCKeditor Not Showing

I am trying to get FCKeditor to work on my website using php.

//basic editor:
$oFCKeditor = new FCKeditor('tech') ;
$sBasePath = $base.'admin/fckeditor/'

//$sBasePath = $_SERVER['PHP_SELF'] ;
//$sBasePath = substr( $sBasePath, 0, strpos( $sBasePath, "admin" ) ) ;

$oFCKeditor->Config['CustomConfigurationsPath'] = $sBasePath.'myConfig2.js'
$oFCKeditor->Config['EditorAreaCSS'] = $base.'styles/default.css'

$oFCKeditor->BasePath = $sBasePath ;
$oFCKeditor->ToolbarSet = 'Macarbi' ;

$oFCKeditor->Config['SkinPath'] = $sBasePath.'editor/skins/office2003/'
$oFCKeditor->Value = $tech;
where $base is: $base = '/home/public_html/'

this works fine on my development machine (Windows).

I upload to my prod server (Linux) and get a 404 error. (I changed the path and it is definately right. i have check about a million times!).

I try change the base to a relative url (./) and it seems to find it, but gives me a blank area. looking at the source it is doing loading and creating the correct code (the same as the code from my dev machine, but just with the relitive paths).