function ave(form) {
form.mean.value = "0";
var average1 = form.rhrone.value;
var average2 = form.rhrtwo.value;
var average3 = form.rhrthree.value;
var age = form.age.value;
var mean = form.mean.value;
var max_heartrate = form.maxheartrate.value;
	form.mean.value = (parseFloat(average3)+parseFloat(average1)+parseFloat(average2))/3;
        form.maxheartrate.value = (220-age);
	form.heartratereserve.value = (form.maxheartrate.value) - (form.mean.value);/*(max_heartrate)-(mean); why doesn't this varibles thing work?*/
form.trainingzone1.value = Math.round((form.heartratereserve.value)* .6 +parseFloat(form.mean.value));
form.trainingzone2.value = Math.round((form.heartratereserve.value)* .7 +parseFloat(form.mean.value));
form.trainingzone3.value = Math.round((form.heartratereserve.value)* .8 +parseFloat(form.mean.value));
form.trainingzone4.value = Math.round((form.heartratereserve.value)* .85 +parseFloat(form.mean.value));
}