Dear all
+ In my code to display image using javascript as bellow
+ I have 2 options include: year (2010, 2011,..) and month (Jan, Feb,..)
It mean we click on 2 options allow to display image, respectively.
But in my code only allow link 1 option is month (year option is denied)
I'd like to link both options
Please tell me repair
Thank you
My code:

<script language="javascript">
function showimage()
{
if(!document.images)
return
document.images.pictures.src=
document.mygallery.picture.options[document.mygallery.picture.selectedIndex].value
}
</script>

<table width="1000" height="1000" border="3" cellpadding="0" cellspacing="0">
<tr>
<td style="background-color:#FFD700">
<form name="mygallery">
<p align="center">
<select name="picture" onChange="showimage()">
<option selected value="prob_Jan_2010.gif">Jan</option>
<option value="prob_Feb_2010.gif">Feb</option>
<option value="prob_Mar_2010.gif">Mar</option>
</select>
</p>
</form>
</td>

<td style="background-color:#FFD700">
<form action="">
<p align="center">
<select>
<option value="2011">2011</option>
<option value="2010">2010</option>
</select>
</p>
</form>
</td>


<td style="background-color:#FFD700">
<script type="text/javascript">
document.write("Tropical Cyclones")
</script>

</td>
</tr>

<tr>
<td colspan="3">
<p align="center"><img src="prob_Jan_2010.gif" name="pictures" width="900" height="800"/></p>
</td>
</tr>
</table>