Moves the element slightly to the left, then to the right, repeatedly.
script.aculo.us V1.0 and later.
Effect.Shake('id_of_element');
Click for Effect.Shake demo
Works safely with most Block Elements, except tables.
Items in bold are default values.
Effect.Shake('id_of_element',{distance:5}); // small quick shake
Effect.Shake('id_of_element',{distance:100,duration:5}); // long, slow, shake