function calculate(form) {
	var i=0
	var SRT = parseFloat(form.elements[i].value); i++
	var k = parseFloat(form.elements[i].value); i++
	var Y = parseFloat(form.elements[i].value); i++
	var kd = parseFloat(form.elements[i].value); i++
	var Ks = parseFloat(form.elements[i].value); i++

	var S = Ks*(1+kd*SRT)/(SRT*(Y*k-kd)-1)
	document.outputForm.elements[0].value = S.toFixed(2)
}

function setTypicalValues(form) {
	var i=0
	form.elements[i].value = 6; i++
	form.elements[i].value = 12.5; i++
	form.elements[i].value = 0.40; i++
	form.elements[i].value = 0.10; i++
	form.elements[i].value = 10; i++
	calculate(form)
}