If it's not working for you, your event is likely getting grabbed by some other event. Try adding a new file and paste it in there.
This code is very ineffective however, it's likely that I copied it from somewhere else due to laziness as it does not look like my style of scripting.
I recommend scripting something similar yourself, you can use it as a template with your original ideas to make it easy on yourself. This is the best way to learning and you will be able to debug and understand what it is you're creating yourself far better as well.
