当option发生改的事件，然后用ajax请求数据，加载到<div class=test><div>怎么写呢？

<div>
<select id="sel1" onchange="selChange(this)">
<option value='1'>A</option>
<option value='2'>B</option>
<option value='3'>C</option>
<option value='4'>D</option>
<option value='5'>E</option>
</select>
</div>
<script type="text/javascript" >
function selChange(obj)
{
var oi = obj.options[obj.selectedIndex].value;
var ot = obj.options[obj.selectedIndex].innerText;
alert(oi + "||" + ot);
}
</script>