//initialize form -- set readonly fields

	$('hvac_payment').readOnly = true;
	$('yearly_percentage').readOnly = true;
	$('energy_savings').readOnly = true;

	//make heating the active energy calculator
	change2active($('calculate_heating'))

function change_payment( response){
	$('hvac_payment').value = response;
}
 

function change_energy_percentage( response){
	$('yearly_percentage').value = response;
}

function change_energy_savings( response){
	$('energy_savings').value = response;
}

$("calculate_button").addEvent("click",function(e){
e = new Event(e);
	var price = $('hvac_equipment').getValue();
	var terms = $('hvac_terms').getValue();
	var apr = $('hvac_apr').getValue();
	var myXHR = new XHR({method: 'post',
		onSuccess: function() { change_payment(myXHR.response['text']);  }
		}).send("../../ajax_php_files/calculate_payment.ajax.php?price="+price+"&terms="+terms+"&apr="+apr);
	});


function change2active(activeButton){
	//reset shown result
	$('yearly_percentage').value = '';
	$('energy_savings').value = '';

	if(activeButton.value=='Heating'){
		activeButton.style.background = '#d70';
		$('calculate_cooling').style.background = '#f90';

		$('seer').style.display = 'none';
		$('afue').style.display = '';
	}
	else{
		activeButton.style.background = '#d70';
		$('calculate_heating').style.background = '#f90';
		$('seer').style.display = '';
		$('afue').style.display = 'none';
	
	}
}
function getCoolingSavings(sentElement){
	var measure = sentElement.value;
	var myXHR = new XHR({method: 'post',
		onSuccess: function() { change_energy_percentage(myXHR.response['text']);  }
		}).send("../../ajax_php_files/calculate_energy.ajax.php?type=cooling&measure="+measure+"&result_type=percentage");
	var myXHR1 = new XHR({method: 'post',
		onSuccess: function() { change_energy_savings(myXHR1.response['text']);  }
		}).send("../../ajax_php_files/calculate_energy.ajax.php?type=cooling&measure="+measure+"&result_type=5year");
	}

function getHeatingSavings(sentElement){
	var measure = sentElement.value;
	var myXHR = new XHR({method: 'post',
		onSuccess: function() { change_energy_percentage(myXHR.response['text']);  }
		}).send("../../ajax_php_files/calculate_energy.ajax.php?type=heating&measure="+measure+"&result_type=percentage");
	var myXHR1 = new XHR({method: 'post',
		onSuccess: function() { change_energy_savings(myXHR1.response['text']);  }
		}).send("../../ajax_php_files/calculate_energy.ajax.php?type=heating&measure="+measure+"&result_type=5year");
	}