//Written by Manuel Villanueva
function dosage(form) {
var answer = (form.ordered.value / form.available.value) * form.volume.value;
form.answer.value = Math.round(100*answer)/100;

//if statements--
if((form.ordered.value==null)||(form.ordered.value=="")||(isNaN(form.ordered.value))){
alert('Please enter a dosage with numbers and or periods only. All other characters are not allowed');
form.ordered.focus();
form.ordered.select();
return false
}
if((form.available.value==null)||(form.available.value=="")||(isNaN(form.available.value))){
alert('Please enter a dosage with numbers and or periods only. All other characters are not allowed');
form.available.focus();
form.available.select();
return false
}
if((form.volume.value==null)||(form.volume.value=="")||(isNaN(form.volume.value))){
alert('Please enter a volume with numbers and or periods only. All other characters are not allowed');
form.volume.focus();
form.volume.select();
return false
}
}