It's very common to realize some elements (button, border, links) that need a change of pointer over them, for example the link text change mouse to an hand:


Example of changing pointer icon

The code to realize that is very simple:

on mouseenter 
     set the cursor to hand
     lock cursor
end mouseenter

on mouseleave   
     unlock cursor
end mouseleave

on MouseUp
   revMail ""
end MouseUp