Img add + link

I builed the img browser from start.. he show the tumb images in the folders..

I want when user select a img, to add it to the editor with a link..

something like that:
<a href="javascript:OpenImg('filename.jpg');"><img src="filename.jpg"></a>

I try to edit setImage on fck_image.htm but i not really understand what to do there..

can someone explain me what i need to do?