Image mouseover

Hy there! I’m trying to find a way of expanding an image with an mouseover efect. Basicly i want to put a image of 50X50px and when you put your cursor over, it expands to 100X100px… then when you take the cursor off it shrinks back to the original 50x50px! So does anyone know a wp plugin fot this, or a script that i can use?

Thanks!