function estweight(form){

  var bfactor = 0;

  var i = buttonchoice(form.fishclass);

  var b = buttonselect(form.fishbody);

  var decimals = 2;

  if (form.girth.value < 1){

    var girth_number = 0.58 * form.length.value;

    var girth1 = girth_number * Math.pow(10, decimals);

    var girth2 = perRound(girth1);

    form.girth.value = perRound(girth2 / Math.pow(10, decimals));

    form.MG.value = perRound((girth2 * 25.4)/ Math.pow(10, decimals));

    form.CG.value = perRound((girth2 * 2.54)/ Math.pow(10, decimals));

  }



  if (b == 0){bfactor = 1;}

  if (b == 1){bfactor = 1.05;}

  if (b == 2){bfactor = .95;}



  if (i == 0){var weight_number = eval(form.length.value * form.girth.value * form.girth.value / 900);} // OK

  if (i == 1){var weight_number = eval(form.length.value * form.girth.value * form.girth.value / 800);}

  if (i == 2){var weight_number = eval(form.length.value * form.length.value * form.girth.value / 1200);} // OK

  if (i == 3){var weight_number = eval(form.length.value * form.length.value * form.length.value / 1200); form.girth.value=0; form.MG.value=0; form.CG.value=0;}

  if (i == 4){var weight_number = eval(form.length.value * form.length.value * form.length.value / 3500); form.girth.value=0; form.MG.value=0; form.CG.value=0;} // OK

  if (i == 5){var weight_number = eval(form.length.value * form.length.value * form.length.value / 1600); form.girth.value=0; form.MG.value=0; form.CG.value=0;} // OK

  if (i == 6){var weight_number = eval(form.length.value * form.length.value * form.length.value / 2500); form.girth.value=0; form.MG.value=0; form.CG.value=0;}

  if (i == 7){var weight_number = eval(form.length.value * form.length.value * form.length.value / 5500); form.girth.value=0; form.MG.value=0; form.CG.value=0;} // OK

  if (i == 8){var weight_number = eval(form.length.value * form.length.value * form.length.value / 2800); form.girth.value=0; form.MG.value=0; form.CG.value=0;} // OK

  var weight1 = weight_number * Math.pow(10, decimals);

  var weight2 = perRound(weight1);

  form.weight.value = perRound(weight2 / Math.pow(10, decimals));

  form.G.value = perRound((weight2 * 453.592) / Math.pow(10, decimals));

  form.K.value = perRound((weight2 * .453592) / Math.pow(10, decimals));

}

function buttonchoice(buttonclass) {

  for (var i = 0; i < buttonclass.length; i++) {

    if (buttonclass[i].checked) {

      return i

    }

  }

}



function buttonselect(buttonselect) {

  for (var b = 0; b < buttonselect.length; b++) {

    if (buttonselect[b].checked) {

      return b

    }

  }

}