Active images in Visio 2007

Hi folks,

i have made a organisational chart in Visio 2007 and saved it as JPEG (image)

Organisations chart = 4 rectangles (shapes)

now, 3 are inactive but for one of them, i want to make RECTANVLE ACTIVE, by active i mean, i wish to have a hyperlink.. so the complete image remains intact but when i hover a mouse over this ACTIVE REctnagle, and click the website opens..

Is this possible ? How can i do this ?

Thanks
geekfollower