<!-- Begin
function  doMath() {
var one = eval(document.myform.weight.value)
var salt = 0.0185
var sugar = 0.010
var cure = 0.0025
var vit = 0.0005
var saltcalc = one  *   salt
var sugarcalc = one  *   sugar
var curecalc = one  *   cure
var vitcalc = one  *   vit
var total = saltcalc + sugarcalc + curecalc + vitcalc

document.myform.saltprod.value=custRound(saltcalc,2);
document.myform.sugarprod.value=custRound(sugarcalc,2)
document.myform.cureprod.value=custRound(curecalc,2)
document.myform.vitprod.value=custRound(vitcalc,2)
document.myform.totalprod.value=custRound(total,2)
}
function custRound(x,places) {
return (Math.round(x*Math.pow(10,places)))/Math.pow(10,places)
}

//  End -->