Adding an image to html area

Iam using this html area (WYSIWYG). This editor is included in the jsp.

When i click on the "Insert/Modify Image" icon from the tool bar, the corresponding function will be called in the "htmlarea.js",which will include the selected image in the cursor position of html area.

In the same way, Iam placing a button in jsp, which calls the same function that will popup a window to add a image in the editor.

Iam getting the popup window, but not able to add the image back to the html area.

Somebody help me on this.
Thanks.