More info on goldsmith's ICL7667 comment: Other devices are tsc427 or max427 or TC427 or FAN3327 or similar part. 8 pin dip with 2 devices in it. 5V logic in, VCC up to 18V out.
Some of the manufacturers of these devices: Maxim, Fairchild, TI, Linear Technology, Micrel (the original builder of the parts), even Microchip.
The digikey search is " PMIC - MOSFET, Bridge Drivers - External Switch" // non inverting // 4.5V to 18V supply voltage // 2 outputs. The cheapest parts (TC4427 from microchip) are only $1 from digikey in single quantity.
These are much cheaper or simpler than an opto solution