From the Effects tab, select Custom Effect

We can show a seperate effect when the tooltip appears (Show Effect) and when it hides (Hide Effect)

Refer to jQuery Effects Reference for all the possibilities.

Example: Let's create a Slide Up/Down effect that takes longer to animate than the default Slide Up/Down

Show Effect: function(offset) { jQuery(this).slideDown(1000); }

Hide Effect: function(offset) { jQuery(this).slideDown(1000); }

Tooltip will take entire second (1000ms) to slide up and down.