function feed(form) {

var kcal = (form.kcal.value);

form.dogchow_cup.value = Math.round(10*kcal/433)/10;
form.dogchow_oz.value = Math.round(kcal/54.1);
form.dogchow_ml.value = Math.round(kcal/1.83);

form.iams_cup.value = Math.round(10*kcal/381)/10;
form.iams_oz.value = Math.round(kcal/47.6);
form.iams_ml.value = Math.round(kcal/1.61);

form.nutro_cup.value = Math.round(10*kcal/380)/10;
form.nutro_oz.value = Math.round(kcal/47.5);
form.nutro_ml.value = Math.round(kcal/1.606);


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