Javascript and html fix - small but urgent

This is some javascript vbscript and html that displays some info when the cursor hovers of an icon. It is 98% working but needs some fixes. i) if the product image is at the top of the screen the popup box should be shown down from the top so it is not hidden. This does seem to work ok. ii) if the product image is at the bottom of the screen, the popup box should be shown above the bottom of the screen so it is not hidden. iii) same for left and right. Needed today of possible, else tomorrow morning at the latest. thanks