<!-- Author: Brian Mackenzie -->
<!-- Date: 24 September 2009 -->
<!-- Required by: relay.htm -->
<!-- Copyright BrianMac 2009 -->

function calculate()

{
  var iat = document.relay.ia.value;
  var oat = document.relay.oa.value;
  iav = 25/iat;
  cm=((oat-iat)*iav)+(0.2*iav);
  document.relay.cm.value = nt2dp(cm,2);
}

function valclear()

{
  document.relay.cm.value = "";
}


function nt2dp(num,dp)
{
<!-- rounds num to dp decimal places -->
  num=num*1+(0.55/Math.pow(10,dp));
  if (dp>0) dp=dp+1;
  b=Math.floor(num).toString().length+dp;
  return num.toString().substr(0,b);
}