def attachFile(self, file, id='', title='', precondition='', content_type='', REQUEST=None):  
        """
        Attach a new File object. Creates a new File object 'id' with the contents of 'file'
        """
        title = str(title)
        id = str(id)
        content_type=str(content_type)
        precondition=str(precondition)
        
        # Extract id and title from file 
        # Code below is actually a rip-off from Image.py :)) 
        
        if not id and hasattr(file,'filename'):
            filename=file.filename
            title=title or filename
            id=filename[max(filename.rfind('/'),
                            filename.rfind('\\'),
                            filename.rfind(':'),)+1:]
        
        # First, we re-create the file without data:
        self.attachedDocument = img.File(id,title,'',content_type, precondition)
        # Now we "upload" the data.  By doing this in two steps, we
        # can use a database trick to make the upload more efficient.
        
        if file:
            self.attachedDocument.manage_upload(file)
            
        if content_type:
            self.attachedDocument.content_type=content_type
        # tell to Zope mechanism that CCRazpis object has changed
        self._p_changed = True
        # append file to fileList

        self.fileList.append(self.attachedDocument)
        
        return self.manage_editCCRazpisForm(self, REQUEST)