native CSS is not seen in the editor

I wanted to post some code I developed for when the "native" css file needs to be dynamic:
(I'm not so expert on javascript so this may not be that elegant but it gets the css files of a parent page and loads them here - plus an override css page if present - you can probably figure this out..)

if(window.parent.CMSBGetNativeStyleSheets=='popup'){
   o=window.parent.opener.document.getElementsByTagName('head')[0].innerHTML;
   o=o.split("\n");
   FCKConfig.EditorAreaCSS=[];
   for(i=0; i<o.length; i++){
      t=o[i];
      if(t.indexOf('<link')<0)continue;
      start=t.indexOf('href="')+6;
      t=t.substring(start,1000);
      end=t.indexOf('"');
      t=t.substring(0,end);
      //convert
      t=t.replace(/(\.\.\/)*/g,'');
      t=t.replace(/^\//,'');
      t='/'+t;
      FCKConfig.EditorAreaCSS[FCKConfig.EditorAreaCSS.length]=t;
   }
   //in case any CSS in the native stylesheets does something wierd, include this file in site-local to override it
   FCKConfig.EditorAreaCSS[FCKConfig.EditorAreaCSS.length]='/site-local/CMSB_CSS_override.css';
}else{
   FCKConfig.EditorAreaCSS = FCKConfig.BasePath + 'css/fck_editorarea.css' ;
}

Samuel