How do I fade in or fade out in mouse over sprite object

How do I fade in or fade out in mouse over sprite object?

Add FADE behaviour to the sprite.

Set enabled to no in the properties.

In events, add..

+ MOUSE: On cursor over sprite

+ Trigger Once While True

• sprite: Start Fade

Thank you!!! Now I see my question is inaccurate.

I'm building browser game and I want to add a menu which is slightly transparent (50%) and when i move with the mouse on the menu (my sprite) transparency changes to 100% (Shown) and it shows better and when i leaves the sprite with the mouse the transparent returns to 50%

without animation it would be

+Mouse on cursor over sprite

• sprite set opacity 100

Else - sprite set opacity to 50

if you want the opacity to slowly change:

+Mouse on cursor over sprite

• sprite set opacity sprite.opacity+1

Else

sprite compare opacity > 51

• sprite set opacity to sprite.opacity-1

It works great thanks!!!