function countelem() {
	var count = window.document.partsize.elements.length
	alert (count)
}

function findlength() {
	
	if (window.document.partsize[0].checked==true) {
	var partsize = .002 }
	if (window.document.partsize[1].checked==true) {
	var partsize = .006 }
	if (window.document.partsize[2].checked==true) {
	var partsize = .02 }
	if (window.document.partsize[3].checked==true) {
	var partsize = .06 }
	if (window.document.partsize[4].checked==true) {
	var partsize = .20 }
	if (window.document.partsize[5].checked==true) {
	var partsize = .60 } 

	var p = partsize
	var d = window.document.display.depth.value
	var f = window.document.display.flow.value
	if (f<=0) {
		f=.001
	}

	var s = (Math.pow(p,2))
	var s1 = 2.97*s
	var length = ((d*f)/s1)
	length = (Math.round(length))
	window.document.display.getlength.value = length + " feet"

}