Change background-color of Table row when mouse over

If you have this:

<table>
<tr> <td>Cell 1 </td><td> Cell 2</td> </tr>
<tr> <td>Cell 3 </td><td> Cell 4</td> </tr>
<table>

It's possible to change background color when mouse is over the row?

XHMT no permit this:

<table>
<A><tr> <td>Cell 1 </td><td> Cell 2</td> </tr> </A>
<A><tr> <td>Cell 2 </td><td> Cell 4</td> </tr> </A>
<table>

The last code is not a well-formated XHTML because the tag table only permit <TR>.