function change() 
{ 

document.getElementById('cost').innerHTML = '<font size=2><b> £' + rounded + ' / $' + roundedD; 
document.getElementById('cost2').innerHTML = '<font size=2><b> £' + rounded+ ' / $' + roundedD; 
document.getElementById('nights').innerHTML = ' <font size=2><b> ' + nights; 
document.getElementById('nights2').innerHTML = '<font size=2><b> ' + nights; 

} 

function setCost(howmuch){
document.getElementById('cost').innerHTML = '<font size=2><b> £' + howmuch; 
document.getElementById('cost2').innerHTML = '<font size=2><b> £' + howmuch; 

}

function resetCount(){
number = 0
numberD = 0
rounded = 0
roundedD = 0
nights = 0
change();
document.getElementById('firework').innerHTML = ''
}

function isChecked(object) {
    if (object.checked) return true;
    else return false;
}

function addamount(value, valueD, object)
{
value = value/7
valueD = valueD/7
 if (object.checked){
	 number = number + value;
	 numberD = numberD + valueD;
	 nights = nights + 1;
	 
} else {
	number = number - value;
	numberD = numberD - valueD;
	nights = nights - 1;
	}
rounded = Math.round(number);
roundedD = Math.round(numberD);

}


var number, rounded, nights, numberD, roundedD

number = 0
numberD = 0
nights = 0