function setDisplay(elementId, display) {
	document.getElementById(elementId).style.display = display;
}

function conditionalDisplay(select, elementId, trueDisplay, falseDisplay, condition) {
	if(select.options[select.selectedIndex].value == condition) {
		setDisplay(elementId, trueDisplay);
	} else {
		setDisplay(elementId, falseDisplay);
	}
}