MouseOver cell that makes apear and disappear an image

Hello,
Please Help

I would like to do a routine in VBA on excel 2007 that makes the following:
1- When the mouse is over a cell it pops-up a window that shows a picture;
2- When the pointer is removed from the cell the window that contains the picture closes;
It is very important that the picture that is shown be adressed by a relative path from the folder in which is the excel file.
The pictures can change; this is the reason that the picture should be addressed by a path.

Thanks a lot