Looking for a piece of code

[the thread title is not very descriptive - sorry I had no idea what else to put in this case]

In the past, I found a website where, when you hover a text link, an informative box appears next to the link. It is much like the title attribute in a <a> tag in a HTML document. You know how the title attribute works - you hover over a link, and the value of the title attribute appears in that small yellow box.

What I'm looking for is similar to the effect of the title attribute. The only difference is that, when the link is hovered over, the box appears almost immediately, and with customizable background colour etc.

I am guessing that this is Javascript.

Anyone with any ideas?

Somthing like a tooltip?

YES!

That's the one!