ActionScript 3.0 :: Make MC Into Tooltip?

i have a gallery generated via xml - i have three text fields on the stage that display the title and description of the thumbnail item.

Code:
tn_title.text = "";
tn_desc.text = "";
tn_url.text = "";

I want to make the textfields into a 'tooltip' as opposed to appearing in the same place everytime - ideally within a few pixels of the thumbnail or the mouse. the latter might be the easier.

so i have put the three text fields into an MC and called it tip.

Code:
tip.tn_title.text = "";
tip.tn_desc.text = "";
tip.tn_url.text = "";

this works ok when the MC 'tip' is sitting on the stage. But the question is how do i get the MC to appear next to the thumbnail/mouse when a thumbnail is moused over?

here is the full shabang i highlighted the rows that i think are the relevant ones...

Code:
*/
import org.papervision3d.scenes.*;
import org.papervision3d.cameras.*;
import org.papervision3d.objects.*;

[Code].....