function calcCo2() {
	
	var co2Level = 0
	var co2Level2 = 0
	var co2Level3 = 0
	var co2Level4 = 0
	var co2Level5 = 0
	var co2Level6 = 0
	var co2Level7 = 0
	var q1 = 0
	var q2 = 0
	var q3 = 0
	var q4 = 0
	var q5 = 0
	var q6 = 0

	if(document.boxes.boxOne.checked == true)
		q1 = 300
	if(document.boxes.boxTwo.checked == true)
		q2 = 625
	if(document.boxes.boxThree.checked == true)
		q3 = 850
	if(document.boxes.boxFour.checked == true)
		q4 = 900
	if(document.boxes.boxFive.checked == true)
		q5 = 1050
	if(document.boxes.boxSix.checked == true)
		q6 = 1150

	co2Level = q1 + q2 + q3 + q4 + q5 + q6
	co2Level2 = co2Level * 10
	co2Level3 = co2Level2 * 10
	co2Level4 = co2Level3 * 10
	co2Level5 = co2Level4 * 10
	co2Level6 = co2Level5 * 10
	co2Level7 = co2Level6 * 10

	document.display.displayOne.value = co2Level
	document.display.displayTwo.value = co2Level2
	document.display.displayThree.value = co2Level3
	document.display.displayFour.value = co2Level4
	document.display.displayFive.value = co2Level5
	document.display.displaySix.value = co2Level6
	document.display.displaySeven.value = co2Level7
}