Disable Shipping/Payment method depnding on Payment Method/Cart Total

I have an interesting problem that I cant seem to get my head around how to make a modification on how to resolve. Put simply, I need to disable “Paypal” from being selected if the carts value is below a certain amount, and if Paypal is selected, I don’t want customer to be able to “Pick up from store”. I’m getting tired of people making $3.00 orders via paypal and wanting to pick it up in the store. We currently have to process orders manually as with the products we sell there is no easy way to determine the shipping costs at the point of checkout. I made some JavaScript and tried to do it via Jquery, but theres a onclick handler which keeps overriding everything and without it the page doesn’t refresh/update when a shipping/payment method is changed. Can anyone help?

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