onMouseOver...help?

Ok, so i want to make a little box thing appear when i put my cursor over text... this is what i have:

<a onMouseOver="return escape('A beast with the body of a lion and the wings and head of an eagle')">Griffin</a>


Now, that doesnt work, so can i get some help?

try the title property:

<a title='A beast with the body of a lion and the wings and head of an eagle'>Griffin</a>