<!---
function eta(f3,qts,ql,qtc,vb)
 {
  if ( f3 < 0 )
  {
    var f3 = -f3
    document.ber.f3.value = f3;
  }
  if ( qts < 0 )
  {
    var qts = -qts
    document.ber.qts.value = qts;
  }
  if ( ql < 0 )
  {
    var ql = -ql
    document.ber.ql.value = ql;
  }
  if ( qtc < 0 )
  {
    var qtc = -qtc
    document.ber.qtc.value = qtc;
  }
  if ( vb < 0 )
  {
    var vb = -vb
    document.ber.vb.value = vb;
  }
  var q2 = qtc*qtc;
  var q3 = q2*qtc;
  var q4 = q2*q2;
  var kn = -0.97*q4+6.8961*q3-18.115*q2+20.226*qtc-6.0349;
  var etacb = kn*f3*f3*f3*vb;
  var etacb = 10*(Math.log(etacb)/Math.LN10)+22.02;
  var etacb = Math.round(100 * etacb) / 100;
  document.ber.etacb.value = etacb;
  var q2 = qts*qts;
  var q3 = q2*qts;
  var q4 = q2*q2;
  var q5 = q3*q2;
  var kn = 98.532*q5-185.79*q4+115.29*q3-29.02*q2+3.2402*qts+2.2231;
  var tmp1 = ql/7;
  var tmp1 = tmp1-1;
  var tmp2 = 1.4-qts;
  var tmp2 = ql*tmp2;
  var tmp = Math.pow(10,tmp1/tmp2);
  var etabr = kn*tmp*f3*f3*f3*vb;
  var etabr = 10*(Math.log(etabr)/Math.LN10)+22.02;
  var etabr = Math.round(100 * etabr) / 100;
  document.ber.etabr.value = etabr;


  var diff = etabr - etacb;
  var diff = Math.round(100 * diff) / 100;
  document.ber.diff.value = diff + " dB";

 }
//--->