function calcGearRatio() {
	if(document.form1.rpmField.value == "") {
		alert("Please enter desired RPM!")
		document.form1.rpmField.focus()
		return false
	}
	if(document.form1.frontPrimaryField.value == "") {
		alert("Please enter number of teeth on front primary sprocket or pulley!")
		document.form1.frontPrimaryField.focus()
		return false
	}
	if(document.form1.rearPrimaryField.value == "") {
		alert("Please enter number of teeth on rear primary sprocket or pulley!")
		document.form1.rearPrimaryField.focus()
		return false
	}
	if(document.form1.firstGearField.value == "") {
		alert("Please enter gear ratio!")
		document.form1.firstGearField.focus()
		return false
	}
	if(document.form1.secondGearField.value == "") {
		alert("Please enter gear ratio!")
		document.form1.secondGearField.focus()
		return false
	}
	if(document.form1.thirdGearField.value == "") {
		alert("Please enter gear ratio!")
		document.form1.thirdGearField.focus()
		return false
	}
	if(document.form1.fourthGearField.value == "") {
		alert("Please enter gear ratio!")
		document.form1.fourthGearField.focus()
		return false
	}
	if(document.form1.fifthGearField.value == "") {
		alert("Please enter gear ratio!")
		document.form1.fifthGearField.focus()
		return false
	}
	if(document.form1.sixthGearField.value == "") {
		alert("Please enter gear ratio. If no sixth enter ratio for 5th!")
		document.form1.sixthGearField.focus()
		return false
	}
	if(document.form1.jackShaftInField.value == "") {
		alert("Please enter number of teeth on the transmission output sprocket!")
		document.form1.jackShaftInField.focus()
		return false
	}
	if(document.form1.jackShaftOutField.value == "") {
		alert("Please enter number of teeth on jackshaft input sprocket!")
		document.form1.jackShaftOutField.focus()
		return false
	}
	if(document.form1.transPulleyField.value == "") {
		alert("Please enter number of teeth on jackshaft output sprocket!")
		document.form1.transPulleyField.focus()
		return false
	}
	if(document.form1.rearWheelPulleyField.value == "") {
		alert("Please enter numberof teeth on final drive rear wheel sprocket or pulley!")
		document.form1.rearWheelPulleyField.focus()
		return false
	}
	if(document.form1.rearTireDiameterField.value == "") {
		alert("Please enter diameter of rear tire in inches!")
		document.form1.rearTireDiameterField.focus()
		return false
	}
	if(document.form1.tireGrowthField.value == "") {
		alert("Please enter 1 for street tires or 1.1, 1.15, 1.2 etc. for drag racing slicks!")
		document.form1.tireGrowthField.focus()
		return false
	}
	
	var rpm;
	var fp;
	var first;
	var second;
	var third;
	var fourth;
	var fifth;
	var sixth;
	var jackin;
	var jackout;
	var transpulley;
	var rearpulley;
	var tirediam;
	var growth;
	var temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8, temp9, temp10, temp11, temp12, temp13, temp14;
	var result1, result2, result3, result4, result5, result6, result7;
	rpm = document.form1.rpmField.value;
	fp = document.form1.frontPrimaryField.value;
	rp = document.form1.rearPrimaryField.value;
	first = document.form1.firstGearField.value;
	second = document.form1.secondGearField.value;
	third = document.form1.thirdGearField.value;
	fourth = document.form1.fourthGearField.value;
	fifth = document.form1.fifthGearField.value;
	sixth = document.form1.sixthGearField.value;
	jackin = document.form1.jackShaftInField.value;
	jackout = document.form1.jackShaftOutField.value;
	transpulley = document.form1.transPulleyField.value;
	rearpulley = document.form1.rearWheelPulleyField.value;
	tirediam = document.form1.rearTireDiameterField.value;
	growth = document.form1.tireGrowthField.value;
	temp1 = rpm * (fp / rp) * (jackin / jackout);
	temp2 = transpulley / rearpulley;
	temp3 = temp1 * temp2;
	temp4 = tirediam * growth * 3.1416; 
	temp5 = temp3 * temp4;
	temp6 = temp5 / 12;
	temp7 = temp6 * 60;
	temp8 = temp7 / 5280;
	temp9 = temp8 / first;
	temp10 = temp8 / second;
	temp11 = temp8 / third;
	temp12 = temp8 / fourth;
	temp13 = temp8 / fifth;
	temp14 = temp8 / sixth;
	result1 = parseInt(temp9 * 100) / 100;
	result2 = parseInt(temp10 * 100) / 100;
	result3 = parseInt(temp11 * 100) / 100;
	result4 = parseInt(temp12 * 100) / 100;
	result5 = parseInt(temp13 * 100) / 100;
	result6 = parseInt(temp14 * 100) / 100; 
	document.form1.firstResultField.value = result1;
	document.form1.secondResultField.value = result2;
	document.form1.thirdResultField.value = result3;
	document.form1.fourthResultField.value = result4;
	document.form1.fifthResultField.value = result5;
	document.form1.sixthResultField.value = result6;
	document.form1.rpmResultField.value = rpm;
}