function compute(form) {
var milesPerMo = form.avgMiles.value *30.4;
var mpgcalc = (form.milesDriven.value / form.gallons.value) * 1;
var moGascalc = (((form.avgMiles.value * 30.4) / mpgcalc) * form.ppGal.value) * 1;
mpgcalc = twoDecs(mpgcalc);
moGascalc = twoDecs(moGascalc);
form.mpg.value = mpgcalc;
form.moGas.value = moGascalc;
form.yrGas.value = moGascalc * 12;
}
function twoDecs(item) {
return eval(parseInt(item * 100) * .01);
}