I would like to be able to offer customers the choice of selecting shipping insurance when they purchase from my site.

I figure an option/checkbox that when checked by the customer would cause GOCart to calculate shipping insurance based on a percentage of the total order value, then display this additional cost on the invoice below shipping cost and of course take this into consideration when calculating the total cost.

Local and overseas shipping insurance are different rates and so I would like to be able to set/change the rates for both local and overseas.

Is this possible and if so can anyone suggest where I might start