You can use 
 or 
 .
Yes - ToolTips obey "\r\n" characters and start on a new line.
HTML title Attribute The title attribute specifies extra information about an element. The information is most often shown as a tooltip text when the mouse moves over the element. The title attribute can be used on any HTML element (it will validate on any HTML element. However, it is not necessarily useful).
This should now work with Internet Explorer, Firefox v12+ and Chrome 28+
<img src="'../images/foo.gif'"
alt="line 1
line 2" title="line 1
line 2">
Try a JavaScript tooltip library for a better result, something like OverLib.
One way to achieve similar effect would be through CSS:
<td>Cell content.
<div class="popup">
This is the popup.
<br>
Another line of popup.
</div>
</td>
And then use the following in CSS:
td div.popup { display: none; }
td:hover div.popup { display: block; position: absolute; }
You will want to add some borders and background to make the popup look decent, but this should sketch the idea. It has some drawbacks though, for example the popup is not positioned relative to mouse but relative to the containing cell.
The Extensible Markup Language (XML) 1.1 W3C Recommendation say
« All line breaks MUST have been normalized on input to #xA as described in 2.11 End-of-Line Handling, so the rest of this algorithm operates on text normalized in this way. »
The link is http://www.w3.org/TR/2006/REC-xml11-20060816/#AVNormalize
Then you can write :
<td title="lineone 
 linetwo 
 etc...">
Using 

Works in Chrome to create separate lines in a tooltip.
This should be OK, but is Internet Explorer specific:
<td title="lineone
linetwo
etc...">
As others have mentioned, the only other way is to use an HTML + JavaScript based tooltip if you're only interested in the tooltip. If this is for accessibility then you will probably need to stick to just single lines for consistency.
Using 
didn't work in my fb app.
However this did, beautifully (in Chrome FF and IE):
<img src="'../images/foo.gif'" title="line 1<br>line 2">
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