[jQuery] an unusual bug. addClass to td inside tr with a class doesn't affect the cell

[Equand]

html:

<table>
<tr><td></td><td></td></tr>
<tr class="odd"><td></td><td></td></tr>
</table>

css:

.odd {
background-color: red;
}
.dead {
background-color: yellow;
}

javascript:

$("td").hover(
function()
{
$(this).addClass("dead");
},
function()
{
$(this).removeClass("dead");
}
);

this won't work on .odd rows for me... dunno why...
however changing css affects this...