Increasing the font size on an html "title" attribute

How can I increase the font size on tooltip text (i.e., for the html "title" attribute)?

MORE DETAIL:

I'm creating my own tool tips to pop up when a respondent hovers over an info icon E.g.,

My Feature <img src="[%GraphicsPath()%]info_icon.png" alt="" border="0" title="My tooltip text">

But the default font size is so small! I've tried a number of things like:

My Feature <img src="[%GraphicsPath()%]info_icon.png" alt="" border="0" title="My tooltip text" font size="10">

and had no success. It doesn't appear that there's a straightforward solution.

Resolved
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