Add extra charge to product

[jesper03]

Hi everyone, I need to add a checkbox to the product page so when the customer check it the price is increased by a certaing amount.

I now that this can be accomplished using combinations but I can't use them because of other requirements.

Example:

Say that a certaing product costs 80€.

If the customer check the "famous" checkbox the price should be increased to 85€.

If a combination is selected and its cost is 100€, when the customer check the checkbox the price should be increased to 105€.

Hope that everything is clear.

Have a good work.