The easiest way to do what you're saying is to use the OE H13 plug's highbeam circuit to trip the relay for your driving lights.
Since that circuit is pulse-with modulated (through the canbus), it will have to have a capacitor wired inline to prevent the relay from buzzing and melting.
If this sounds scary, call Rallylights.com and talk to them. I had them build me a jumper like I described above so that I could have a plug-n-play set-up.
Just call them; they'll know what I'm saying and will build you something easy/safe to use. For legal and best performance purposes, you'll want the driving lights to only come on with the highbeams.
Mine worked great.