function showcredit()

{

var credit

credit="Script programmed by Jens T.Saetre"

credit+="\n16082000 First version uploaded"

credit+="\n08122002 Changed layout"

window.alert(credit);











}



function Calculate()

{

var GainSidelobe,Attenuationsidelobe,Theta,Gain,Pattern ;



Theta=document.Sidelobe.Theta.value; 

Pattern =document.Sidelobe.Pattern.value; 

Gain=document.Sidelobe.Gain.value; 



Gainsidelobe=Pattern-25*(Math.log(Theta)/Math.log(10));

Attenuationsidelobe=(Gain-Pattern)+25*(Math.log(Theta)/Math.log(10));



//10*( Log(CalculatedGain) / Log(10))



document.Sidelobe.Sidelobegain.value=formatvalue(Gainsidelobe, 4);

document.Sidelobe.Attenuationsidelobe.value=formatvalue(Attenuationsidelobe, 4);

document.Sidelobe.Info.value=formatvalue(document.Sidelobe.Pattern.value, 4); 

}







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);

}