Enlarge and restore an embedded chart from a group of charts

I have a worksheet with six embedded charts on it. I want the user to be able to click on a single chart and it will enlarge; when the user clicks on the enlarged chart a second time, it will return to its original position and size.

My code correctly responds to the first click on the chart but then gets confused with which chart was selected.

I have attached the code for your reference.

Thanks for any help.