custom image upload fails in java

I wrote custom servlet code to upload images to the server and the image is stored in the directory fine. But how do i get the image to display on the textarea. I tried to call the call function from the servlet using "out.println("<script type='text/javascript'>window.parent.CKEDITOR.tools.callFunction("+func+", "+filepath+");</script>");" It does not load any image. I get a Image resource URL missing. Can someone help me with this?