problem to submit value from fckeditor

hello,

I use fckeditor with ajax and php.
i create a function in a class to load fckeditor.
here it is :

class HeadPath(){
function fckEditor($InputName,$value="",$width="100%",$height="200"){
    $oFCKeditor = new FCKeditor($InputName);
    $oFCKeditor->Width  = $width ;
    $oFCKeditor->Height = $height ;
    $oFCKeditor->Config["AutoDetectLanguage"] = true ;
    $oFCKeditor->Config["DefaultLanguage"] = "fr" ;
    $oFCKeditor->ToolbarSet = 'Basic';
    $oFCKeditor->Value = $value;
    $oFCKeditor->Create() ;
  }
}

i load a form in a webpage with ajax and in it i load my fck editor like this

 $headF= new HeadPath();
<form id='NouveauProjet' name='NouveauProjet' enctype='multipart/form-data' method='post' action='#' >
 $headF->fckEditor("resultatAttenduTest",$resultatAttendu,"100%");
<input type='button' name='ajouterTest' id='ajouterTest' value='ajouter le test' ".$JScriptBouton.">
</form>

I write a text in fck.
when i submit my form in a normal form in a test web page there is no problem (without loading and submiting by ajax)
but
when i load the form by an ajax web page and when i submit the form with an ajax function like Ajax.updater from prototype the value is not transmit when i do a

var_dump($_REQUEST)

to see what value is submited from my form

i don't know if what i'm saying is clear but if you have any idea where the problem come from ???

thanks in advance