var mainArray = new Array (
	"--", "Metric", "",
	"km/sec", "kilometer per second", "km/s",
	"m/sec", "meter per second", "m/s",
	"km/hr", "kilometer per hour", "-",
	"m/min", "meter per minute", "-",
	"--", "British And American", "",
	"mile/sec", "mile per second", "-",
	"mile/hr", "mile per hour", "mph",
	"foot/sec", "foot per second", "-",
	"--", "Nautical", "",
	"knot", "knot", "-",
	"nmile/hr", "sea mile per hour", "-",
	"--", "Other", "",
	"mach", "speed of sound in gas (mach)", "-",
	"c", "speed of light in vacuum", "-");

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