Customer option - display only products in stock

[tonis]

Hello

I want to generaly display all product in front end, in stock and out of stock products. But I want to have an option for the customer, to see only products that are in stock.
For example the customer is on the category page where both kind of products are displayed, but there is a option like "display only products in stock", but if he wants he can display also the product out of stock. The "display only products in stock" could be also the default option, but he would still have the option "display all", this would be the best...

Any ideas?

J 2.5.14
VM 2.0.24