Issues with custom image-plugin

Hi there,

my name is Marc and I try to create an image-plugin for my cms. I apologize for my poor english in advance.

The problem I have is, when I save an image (new src), the preview in the editor displays the image with the new source correctly but when I save the data or switch to the sourcecode, the new src changes the the previous one. The alt- and the title-attribute are working correctly indeed. I really don't know what to do..

This is the js-function I use to set the new attributes to the image:

function Ok() {
   if (GetE('mgxcms_link_url').value.search(/^(.+)(\.+)([jpg|jpeg|gif|png|bmp]+)$/i) == -1) {
      alert('Es wurde kein Bild ausgewählt.');
      return false;
   }

   oEditor.FCKUndo.SaveUndoStep() ;
   if (oImage) {
      //oImage.src = sFile;
      SetAttribute(oImage, 'src', GetE('mgxcms_link_url').value);
      //SetAttribute(oImage, 'src', sFile);
      SetAttribute(oImage, 'alt', GetE('mgxcms_link_alt').value);
      SetAttribute(oImage, 'title', GetE('mgxcms_link_title').value);
   } else {
      var img = FCK.EditorDocument.createElement('img');
      SetAttribute(img, 'src', GetE('mgxcms_link_urlt').value);
      SetAttribute(img, 'alt', GetE('mgxcms_link_alt').value);
      SetAttribute(img, 'title', GetE('mgxcms_link_title').value);
      SetAttribute(img, 'border', 0);
      FCK.InsertElement( img ) ;
   }
   oEditor.FCKSelection.SelectNode(oImage);
   //dialog.CloseDialog();
   return true;
}

I would be pleased to get a solution for this f... problem.