[TYPO3] Click-enlarge with tooltip in Internet Explorer

[Christopher]

Hi,

in a click-enlarge-window I have the following code:
<a href="javascript:close();" title="Click to close"><img 
src="uploads/pics/Pic4711.jpg" width="700" height="555" border="0" alt="" 
/></a>

(I got that by adding a wrap around the image:
tt_content.image.20.1.imageLinkWrap.wrap = <a href="javascript:close();" 
title="Click to close"> | </a>)

In Firefox I see the title from the a-tag as a tooltip (which is exactly 
what was intended).

But in Internet Explorer I don't see any tooltip.
How can I get one there too?

Christopher