Insert image in post with modification code

Hi! Now, when I insert image at editor I have some code like this:
<a href="http://localhost/usmotrel/wp-content/uploads/2012/03/tr.-514.jpg"><img class="alignleft size-medium wp-image-9" title="tr. 514" src="http://localhost/usmotrel/wp-content/uploads/2012/03/tr.-514-300x199.jpg" alt="" width="300" height="199" /></a>
I want that image open at popup, and my code must look like:
<a href="http://localhost/usmotrel/wp-content/uploads/2012/03/tr.-514.jpg" class="thickbox" title="title"><img class="alignleft size-medium wp-image-9" title="tr. 514" src="http://localhost/usmotrel/wp-content/uploads/2012/03/tr.-514-300x199.jpg" alt="" width="300" height="199" /></a>