一个简单的问题！如果给DropDownList加值！！

<body>
<SELECT id="DDL" name="DDL"></SELECT>
<script language=javascript>
BindDDL()
function BindDDL()
{
var oOption;
var al = new Array('aaa','bbb','ccc');
for(var i=0;i<al.length;i++)
{
oOption=document.createElement("option");
oOption.innerText = al[i];
oOption.value = al[i];
document.all.DDL.appendChild(oOption); }
alert(document.all.DDL.innerHTML);
}
</script>
</body>