function conflevel(form) {
var n1 = eval(form.QtyA.value);
var r1 = eval(form.GiftsA.value);
var n2 = eval(form.QtyB.value);
var r2 = eval(form.GiftsB.value);
var p1 = r1/n1
var p2 = r2/n2
var respA = p1*100
var respB = p2*100

var denom = Math.sqrt(((p1*(1-p1))/(n1-1))+((p2*(1-p2))/(n2-1))) 
var Z = Math.abs((p1-p2)/denom)

form.respA.value = respA
form.respB.value = respB


if (Z>= 0) form.answer.value = '<80'
if (Z>= 1.280) form.answer.value = 80
if (Z>= 1.310) form.answer.value = 81
if (Z>= 1.340) form.answer.value = 82
if (Z>= 1.370) form.answer.value = 83
if (Z>= 1.410) form.answer.value = 84
if (Z>= 1.440) form.answer.value = 85
if (Z>= 1.480) form.answer.value = 86
if (Z>= 1.515) form.answer.value = 87
if (Z>= 1.555) form.answer.value = 88
if (Z>= 1.600) form.answer.value = 89
if (Z>= 1.645) form.answer.value = 90
if (Z>= 1.695) form.answer.value = 91
if (Z>= 1.750) form.answer.value = 92
if (Z>= 1.810) form.answer.value = 93
if (Z>= 1.880) form.answer.value = 94
if (Z>= 1.960) form.answer.value = 95
if (Z>= 2.055) form.answer.value = 96
if (Z>= 2.170) form.answer.value = 97
if (Z>= 2.330) form.answer.value = 98
if (Z>= 2.575) form.answer.value = 99 ;
}