function convert(form) {
	var i = form.steroid1.selectedIndex
	var steroid1 = form.steroid1.options[i].value
	var steroidDose1 = form.steroidDose1.value
	var j = form.steroid2.selectedIndex
	var steroid2 = form.steroid2.options[j].value

	if ((steroidDose1 == "") || (steroidDose1 <= 0) || (isNaN(steroidDose1))) {
		alert("Please enter a steroid dose.");
		form.steroidDose1.focus();
		form.steroidDose1.select();
		return false;
	}

	var potency1 = potentText(steroid1);
	var duration1 = durationText(steroid1);
	form.potency1.value = potency1;
	form.duration1.value = duration1;
	
	var potency2 = potentText(steroid2);
	var duration2 = durationText(steroid2);
	form.potency2.value = potency2;
	form.duration2.value = duration2;

	var steroidDose2 = steroidDose1 * potency1 / potency2;
	form.steroidDose2.value = roundNum(steroidDose2,1);
	return true;
}

function potentText(steroid) {
	if (steroid == "Hydrocortisone") {var potency = 1}
	if (steroid == "Cortisone") {var potency = 0.8}
	if (steroid == "Prednisolone") {var potency = 4}
	if (steroid == "Prednisone") {var potency = 4}	
	if (steroid == "Methylprednisolone") {var potency = 5}
	if (steroid == "Triamcinolone") {var potency = 5}
	if (steroid == "Paramethasone") {var potency = 10}
	if (steroid == "Dexamethasone") {var potency = 25}
	if (steroid == "Betamethasone") {var potency = 30}
	
	return potency;
}

function durationText(steroid) {
	if (steroid == "Hydrocortisone" || steroid == "Cortisone") {var duration = "Short"}
	if (steroid == "Prednisolone" || steroid == "Prednisone" || steroid == "Methylprednisolone"
		|| steroid == "Triamcinolone") {var duration = "Intermediate"}
	if (steroid == "Paramethasone" || steroid == "Dexamethasone" || steroid == "Betamethasone") {var duration = "Long"}

	return duration;
}


function roundNum(thisNum,dec) {
	thisNum = thisNum * Math.pow(10,dec)
	thisNum = Math.round(thisNum)
	thisNum = thisNum / Math.pow(10,dec)
	return thisNum
}