mouse up - runs when the mouse button is released over the field (I'll have to check, but I believe this only runs if the mouse was originally pressed while over the field, and not when pressed elsewhere and moved over the field to release)
mouse down - runs when the mouse button is pressed over the field
mouse enter - runs when the mouse is moved over the field
mouse exit - runs when the mouse is moved off of the field
on focus - runs when the field becomes active
on blur - runs when the user exits the field
