function fatcalc()
{
var calories = parseFloat(document.fat.calories.value);

var fat1 = Math.round(calories * 0.15);
var fat2 = Math.round(calories * 0.2);

var fatgrams1 = Math.round(fat1 / 9);
var fatgrams2 = Math.round(fat2 / 9);

document.fat.fat1.value = fat1;
document.fat.fat2.value = fat2;
document.fat.fatgrams1.value = fatgrams1;
document.fat.fatgrams2.value = fatgrams2;
    }