function calcTrail() {
    if(document.form1.wbase.value == "") {
		alert("Please enter wheelbase in inches!")
		document.form1.wbase.focus()
		return false
	}
	if(document.form1.tirediam2.value == "") {
		alert("Please enter rear tire diameter in inches!")
		document.form1.tirediam2.focus()
		return false
	}
	if(document.form1.tirediam.value == "") {
		alert("Please enter a front tire diameter in inches!")
		document.form1.tirediam.focus()
		return false
	}
	if(document.form1.rake.value == "") {
		alert("Please enter a steering head rake in degrees!")
		document.form1.rake.focus()
		return false
	}
	if(document.form1.offset.value == "") {
		alert("Please enter an offset value in inches!")
		document.form1.offset.focus()
		return false
	}
	if(document.form1.length1.value == "") {
		alert("Please enter length of front forks in inches!")
		document.form1.length1.focus()
		return false
	}
	if(document.form1.tripletree.value == "") {
		alert("Please enter triple tree rake in degrees!")
		document.form1.tripletree.focus()
		return false
	}
	if(document.form1.length2.value == "") {
		alert("Please enter new fork length in inches!")
		document.form1.length2.focus()
		return false
	}
	raker = ((document.form1.rake.value * 1) / 180) * Math.PI
	tripletreer = ((document.form1.tripletree.value * 1) / 180) * Math.PI
	fork1 = (document.form1.rake.value * 1) +  (document.form1.tripletree.value * 1)
	fork1r = (fork1 / 180) * Math.PI
	centerline1 = document.form1.wbase.value * 1
	d = Math.cos(raker) * (document.form1.offset.value * 1)
	b = Math.sin(fork1r) * (document.form1.length1.value * 1)
	c1 = Math.cos(fork1r) * (document.form1.length1.value * 1)
	c = c1 - (Math.sin(raker) * (document.form1.offset.value * 1))
	a = c + ((document.form1.tirediam.value * 1) / 2)
	e = Math.tan(raker) * (a * 1)
	trail1 = e - (b + d)
	f = (document.form1.wbase.value * 1) - (b + d)
	g2 = (f * f) + (c * c)
	g = Math.sqrt(g2)
	h = ((document.form1.tirediam.value * 1) / 2) + (Math.cos(raker) * (document.form1.length1.value * 1))
    i = (document.form1.length2.value * 1) - (document.form1.length1.value * 1)
    j = ((90 / 180) * Math.PI) + fork1r
    k = document.form1.wbase.value * 1
    l = ((k * k) + (i * i)) - (2 * ((k * i) * (Math.cos(j))))
    m = Math.sqrt(l)
    sinb = (i * Math.sin(j)) / m
    anglenew = (Math.asin(sinb) * 180) / Math.PI
    s = anglenew
    rake2 = (document.form1.rake.value * 1) + anglenew
    fork2 = fork1 + anglenew
    rake2r = (rake2 / 180) * Math.PI
    fork2r = (fork2 / 180) * Math.PI
    dd = Math.cos(rake2r) * (document.form1.offset.value * 1)
    bb = Math.sin(fork2r) * (document.form1.length2.value * 1)
    cc1 = Math.cos(fork2r) * (document.form1.length2.value * 1)
    cc = cc1 - (Math.sin(rake2r) * (document.form1.offset.value * 1))
    aa = cc + ((document.form1.tirediam.value * 1) / 2)
    ee = Math.tan(rake2r) * (aa * 1)
    trail2 = ee - (bb + dd)
	test = trail1
	test1 = g
	test2 = centerline1
	test3 = a
	test4 = fork2
	test5 = trail2
	test6 = m
	test7 = g
	test8 = m
	test9 = aa
	test10 = fork1
	test11 = rake2	
	tempj = Math.round(test * 100)
	tempj1 = Math.round(test1 * 100)
	tempj2 = Math.round(test2 * 100)
	tempj3 = Math.round(test3 * 100)
	tempj4 = Math.round(test4 * 100)
	tempj5 = Math.round(test5 * 100)
	tempj6 = Math.round(test6 * 100)
	tempj7 = Math.round(test7 * 100)
	tempj8 = Math.round(test8 * 100)
	tempj9 = Math.round(test9 * 100)
	tempj10 = Math.round(test10 * 100)
	tempj11 = Math.round(test11 * 100)
	tempk = tempj * .01
	tempk1 = tempj1 * .01
	tempk2 = tempj2 * .01
	tempk3 = tempj3 * .01
	tempk4 = tempj4 * .01
	tempk5 = tempj5 * .01
	tempk6 = tempj6 * .01
	tempk7 = tempj7 * .01
	tempk8 = tempj8 * .01
	tempk9 = tempj9 * .01
	tempk10 = tempj10 * .01
	tempk11 = tempj11 * .01
	daRatio = parseInt(tempk * 100) / 100
	daRatio1 = parseInt(tempk1 * 100) / 100
	daRatio2 = parseInt(tempk2 * 100) / 100
	daRatio3 = parseInt(tempk3 * 100) / 100
	daRatio4 = parseInt(tempk4 * 100) / 100
	daRatio5 = parseInt(tempk5 * 100) / 100
	daRatio6 = parseInt(tempk6 * 100) / 100
	daRatio7 = parseInt(tempk7 * 100) / 100
	daRatio8 = parseInt(tempk8 * 100) / 100
	daRatio9 = parseInt(tempk9 * 100) / 100
	daRatio10 = parseInt(tempk10 * 100) / 100 
	daRatio11 = parseInt(tempk11 * 100) / 100  
	document.form1.ratio.value = daRatio
	document.form1.ratio1.value = daRatio1
	document.form1.ratio2.value = daRatio2
	document.form1.ratio3.value = daRatio3
	document.form1.ratio4.value = daRatio4
	document.form1.ratio5.value = daRatio5
	document.form1.ratio6.value = daRatio6
	document.form1.ratio7.value = daRatio7
	document.form1.ratio8.value = daRatio8
	document.form1.ratio9.value = daRatio9
	document.form1.ratio10.value = daRatio10 
	document.form1.ratio11.value = daRatio11  
}