function boilerCalculatorShow(){
	$("#boiler_calculator_holder").load("boiler-calculator.php?reset=1 #boiler_calculator");
	$("#boiler_calculator_holder").show();
	$("#blackout").show();
	$("#blackout").css('width',$(document).width()+'px');
	$("#blackout").css('height',$(document).height()+'px');
	
	setOpacity(document.getElementById('blackout'),0.7);
	
	var h = $('#container').height();
	var w = $('#container').width();
	
	$("#boiler_calculator_holder").css('top',(h-466)/2);
	$("#boiler_calculator_holder").css('left',(w-620)/2);
} 

function boilerCalculatorHide(){	
	$("#blackout").hide();	
	$("#boiler_calculator_holder").hide();
} 

function setOpacity(obj,value) {
	obj.style.opacity = value;
	obj.style.filter = 'alpha(opacity=' + value*100 + ')';
}

function boilerCalculatorSubmit(){
	var q = $('#question_number').val();
	var a = $('input:radio[name=answer]:checked').val();
	if(a==undefined) {
		alert("Please select an answer");
		return false;
	}
	//alert(q+' = '+a);
	$("#boiler_calculator_holder").load("boiler-calculator.php #boiler_calculator",{question_number:q,answer:a});
}

function boilerCalculatorSubmitForm(){
	
	var e = $('#email').val();
	var n = $('#forename').val();
	var p = $('#postcode').val();
	var o = document.getElementById('optin').checked;
	var params = {stage:'form',email:e,forename:n,postcode:p};
	
	if(o) params.optin = 1;
	
	$("#boiler_calculator_holder").load("boiler-calculator.php #boiler_calculator",params);
}