Running a script continuously

Hi, I am looking for a script code so i can run my script continuously until the esc button has been pressed to shop it running. my script creates the work i wish to do but then stops which gives me only one image to work on i require it to run continuously until i stop the script, although i am unable to find away of doing this if anyone knows of a script or could post that part of a script for me i would be most grateful. I have created my image using my script its saving as jpeg and then stops i wish for it to start the script again keeping it in a loop. Thanks