function updateTotals() {

	var adults = document.getElementById('formAdults').value;
	var kids9 = document.getElementById('formChildren1-9').value;
	var kids10 = document.getElementById('formChildren10-17').value;

	var total = 0;
	
	if(adults > 0) {
		total +=  (adults * 100);
		document.getElementById('formAdultsSubtotal').value = '$' + (adults * 100);
	}
	if(kids9 > 0) {
		total +=  (kids9 * 60);
		document.getElementById('formChildren1-9Subtotal').value = '$' + (kids9 * 60);
	}
	if(kids10 > 0) {
		total +=  (kids10 * 80);
		document.getElementById('formChildren10-17Subtotal').value = '$' + (kids10 * 80);
	}
	
	if(total > 0) {
		document.getElementById('formTotal').value = '$' + total;
	}
	
}

window.onload = updateTotals;