How can I use a carriage return in a HTML tooltip?

I'm currently adding verbose tooltips to our site, and I'd like (without having to resort to a whizz-bang jQuery plugin, I know there are many!) to use carriage returns to format the tooltip.

To add the tip I'm using the title attribute. I've looked around the usual sites and using the basic template of:

<a title='Tool?Tip?On?New?Line'>link with tip</a>

I've tried replacing the ? with:

• <br />
• &013; / 

• \r\n
• Environment.NewLine (I'm using C#)

None of the above works. Is it possible?