function showcredit()

{

var credit

credit="Script programmed by Jens T.Saetre 05112000"

credit+="\n08122002 Changed Layout"

window.alert(credit);



//var theResponse = window.prompt("Welcome?","Enter your name here.");

}





function log10(X)

{

return( Math.log(X)/Math.log(10)  );

// works OK !

}







function toNoiseTemperature()

{

var NoiseFigure,NoiseTemperature

NoiseFigure=1*document.Noise.Figure.value;

//NF=10log(1+Teq/290)



NoiseTemperature= 290*(  Math.pow( 10,(NoiseFigure/10)  )  -1) ;

document.Noise.Temperature.value=formatvalue(NoiseTemperature, 5);

}





function toNoiseFigure()

{

var NoiseFigure,NoiseTemperature

NoiseTemperature=1*document.Noise.Temperature.value;

NoiseFigure= 10*log10(1+NoiseTemperature/290) ;

document.Noise.Figure.value=formatvalue(NoiseFigure, 5);

}















function formatvalue(input, rsize) // Desimal avrunding

  {

   var invalid = "**************************";

   var nines = "999999999999999999999999";

   var strin = "" + input;

   var fltin = parseFloat(strin);

   if (strin.length <= rsize) return strin;

   if (strin.indexOf("e") != -1 ||

       fltin > parseFloat(nines.substring(0,rsize)+".4"))

      return invalid.substring(0, rsize);

   var rounded = "" + (fltin + (fltin - parseFloat(strin.substring(0, rsize))));

   return rounded.substring(0, rsize);

}