CKEDITOR,How to write onclick event and onkeyup events for CKEditor TextArea.

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jQuery-UI

Hi,
am creating web application for that am using CKEDITOR.
Now when I click on the CKEDITOR Textarea I want to rise a popup window.

I tried in two ways

1.

<script type="text/javascript">
                                    var myEl = document.getElementById('txt_pr_desc21');
                                    myEl.addEventListener('onclick', function() {
                                    $ProductProfile.dialog('open'); 
                                    });
                                </script>

onclick is working.

2.

<script type="text/javascript">
                                    CKEDITOR.instances['txt_pr_desc21'].on('contentDom', function() {
                                        this.document.on('onclick', function(event) {
                                        $ProductProfile.dialog('open');
                                            alert('ok');
                                        });
                                    });
                                </script>

It is giving error
Microsoft JScript runtime error: Unable to get value of the property 'on': object is null or undefined.

please suggest me, Thanks in advance.