streaching pics and drop down boxes

I want to be able to make a drop down box that goes to a page when the user selects one of the topics..not when they click a button..can someone help me with the below syntax on how i can do that?..

also i want to have a background picture, however it tiles, and i just want a full blown picure of it.


<td>
<form>
<select>
<option>American Government</option>
<option value="aic.html">Chapter Reviews
<option value="av.html">Vocabulary
<option value="ao.html">Other useful stuff
</select>
</form>


</td>

<td>
<form>
<select OnChange="location.href=this.options[this.selectedIndex].value>
<option>American Government</option>
<option value="aic.html">Chapter Reviews
<option value="av.html">Vocabulary
<option value="ao.html">Other useful stuff
</select>
</form>
</td>