function convertdb2watts(form)
{
  form.fDbm.value = eval(form.fDbm.value);
  form.fMw.value = dbw2watts(form.fDbm.value);
}
function dbw2watts(inValue)
{
  return Math.round(Math.pow(10,eval(inValue)/10)*100000)/100000
}

function convertwatts2db(form)
{
  form.fMw.value = eval(form.fMw.value);
  form.fDbm.value = watts2dbw(form.fMw.value);
} 
function watts2dbw(inValue)
{
  return Math.round(10 * Math.log(eval(inValue))/Math.LN10 * 100000)/100000;
}