WordPress Hide Show Content script and activate/deactivate script on screensize

I am currently using jquery.expander.js to hide/show paragraph content. I want to only use this for screen sizes less than 500px width and less (for mobile phones) ONLY. I am working in wordpress 3.5 and genesis theme 1.9.1

My questions:

*If I have not followed the forum rules let me know and I will adjust

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