This example demonstrates the difference between onmousemove, onmouseenter and onmouseover.
onmousemove
Mouse over me!
onmouseenter
Mouse over me!
onmouseover
Mouse over me!
The onmousemove event occurs every time the mouse pointer is moved over an element.
The mouseenter event only occurs when the mouse pointer enters an element.
The onmouseover event occurs when the mouse pointer enters an div element.