How to restrict access of images folder when application made using JSP

Hi
I have developed an application using JSP's and have deployed it on apache tomcat 5.5.24.My application uses images which are stored in a folder named images,the hierarchy is as follows context>dept>branch>images>
The problem i face is that i am able to access the images directly by typing the url in the browser.can anyone please tell me how to restrict access to this folder by others and also how do i access the images using JSP if they are secured by some method??

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