function compute(form)
{
		if (form.Field2.value == null || form.Field2.value == "0")
		{
			alert("\rVolume cannot be 0\rEnter a non-zero value\rand reCalculate")
		}
		else
		{
			form.result.value = 0 + (form.Field1.value / form.Field2.value) * Math.exp(-form.Field3.value * form.Field4.value)
			form.result.value  = this.roundit(form.result.value,3)
		}
}

function roundit(a,b)
{
	c = b - Math.round(0.5 + (Math.log(a)/Math.log(10)))
	c = Math.pow(10,c)
	c = Math.round(c*a)/c
	return c
}