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I just realized while testing an onClick function with firebug that it would be really easy for a user to change the value of the arguments being passed. This could mess thins up.
Is there any easy way to prevent this, especially when arguments need to be passed?
It is impossible. The code is executing on the user’s computer. They are in control.
If they edit it and “mess it up”, then that is on their head.
If they edit it and it submits an HTTP request to your server, and your server allows (for instance) that request to delete data belonging to another user then the problem is that your server didn’t check that the user submitting the request had permission to delete that data before following through.