Coding need on clickfunnels landing page section(javascript) hourly

I have buttons on m landing page that our for purchasing a package. Ther are 3 different packages that so there are 3 different buttons. i have these button going to a differnt page on that page i need javascript code installed on element of the landing page clickfunnel section from a purchase portal we have for the company through businesss pos site.

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This job is quick job i just code inserted on page.that the button goes to