pulse switch?

Hi all, probably in the wrong place but this seemed the best place.. what i actually want is this (but its in the states and I'm in the uk, it'd turn out very expensive to ship it over, a total of $40 probably) http://www.aerostich.com/catalog/US/Autoswitch-p-16948.html But it must be pretty straightforward to make one It takes a 1second pulse from a 12-14v source and this switches on the output to fog lights for example.. a shorter pulse switches it off.. but a constant input has no effect (so you can leave your high beam on like normal withough it turning anything on/off) (so useing the high beam you can switch on/off a device but unless you use a quick/slow pulse it does nothing) Any ideas? could anyone help with a basic circuit design and ideas of the sort of components needed? Thanks for reading

wow! thats teriffic! I do have a bunch of mini relays so that would take up a fair bit less space.. i see theres a variation that can be done without diodes? what type of diodes would be used if i did go that way? (or just big as you can get?) One thing, with relays some wires aren't really carrying any real ampage (the two that are switching) which ones would they be on here? Would it be the red and the blue needing the meatyer 18amp wire and the rest ok with smaller 5amp stuff? or am i missing something? Thanks very much for the reply :D