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// COPYRIGHT © S.Westenskow 1998-2000 e-mail: XSSpl@hotmail.com ***
function atteNuate() {
	var z = document.forms[0].elements[0].value
	var a = document.forms[0].elements[1].value
	var b = Math.round((Math.pow(10, (-a/20)))*1000000000)/1000000000
	var c = b * z
	var r2 = c/(1-b)
	var r1 = Math.round((z - Math.pow((1/r2 + 1/z), -1))* 1000000)/1000000
valuer1 = Math.round((r1)*100)/100
valuer2 = Math.round((r2)*100)/100
document.forms[0].elements[2].value=valuer1
document.forms[0].elements[3].value=valuer2
}
// -->