删除CKEdit实例

我似乎无法根据文档销毁CKEdit的实例。

考虑以下几点:

<input name="txt1" type="text" id="txt1" /><br />
<a href="javascript:void(0);" onclick="create()">Create</a><br />
<a href="javascript:void(0);" onclick="destroy()">Destroy</a>
<script type= "text/javascript" >
<!--
function create() {
    var hEd = CKEDITOR.instances['txt1'];
    if (hEd) {
        CKEDITOR.remove(hEd);
    }
    hEd = CKEDITOR.replace('txt1');
}
function destroy(){
    var hEd = CKEDITOR.instances['txt1'];
    if (hEd) {
        CKEDITOR.remove(hEd);
    }
}
-->
</script>

我错过什么了吗?