enlarging thumbnail images

Hi there,

I have a few things i am doing to a worksheet and need a little guidance regarding the possibilities and a bit of help making it happen.

in my worksheet, the first column of every cell (Starting from A21, A22, A23 and so on) i will be inserting a small thumbnail picture apprx size is 1.03cm x 1.23cm (Quite Small). What i would like to achieve is when you click on that picture or double click it enlarges the image to 4.76cm x 5.48cm ( a decent viewable thumbnail image).

My plan once i can get this and another issue i am working on resolved. the worksheet will be converted to a interactive PDF so these images can be clicked to increase size and clicked again to go back to small thumbnail.

I have read another post about this stating "connect the object to a macro that "loads" or hyperlinks to the actual full sized object when clicked on"

But really have no idea how to do this or where to start.

I did find the following whilst search the net for answers but have no clue about VBA
http://www.mrexcel.com/forum/showthread.php?t=406370

I am using open office (calc) so do not know if i can use Visual Basic and have tried the whole ATL+F11 thing
Cozzienz