Easy style backgroundColor thing

[johanbigud]

hey guys.
why this doesn't work, i would be glad if u helped.

<script type="text/javascript">

function boja(par)
{
switch (par)
{
case "in":
document.getElementById("person").style.backgroundColor='yellow';
case "out":
document.getElementById("person").style.backgroundColor='lightblue';
}
}
</script>

<td width="133" id="person" style="background-color:lightblue" onmouseover="javascript:boja('in')" onmouseout="javascript:boja('out')">Особа</td>

Thanks a lot.
bye,nick.