function formCheck3(theForm) {
	var pressure = theForm.pressure.value;
	var units = theForm.units.value;

	if (units=="mb") {
		if (pressure >= 850 && pressure <= 1050) {
			return true;
		} else {
			alert("Please enter a pressure between 850 mb and 1050 mb or between 25.00 inHg and 31.00 inHg.");
			return false;
		}
	} else {
		if (pressure >= 25 && pressure <= 31) {
			return true;
		} else {
			alert("Please enter a pressure between 850 mb and 1050 mb or between 25.00 inHg and 31.00 inHg.");
			return false;
		}
	}
}