function calc(){
	var km = document.getElementById('km');
	var litr = document.getElementById('litr');
	var gas = document.getElementById('gas');
	var price_benzin = document.getElementById('price_benzin');
	var price_gas = document.getElementById('price_gas');
	km.value = km.value.replace(/\,/,'.');
	litr.value = litr.value.replace(/\,/,'.');
	gas.value = gas.value.replace(/\,/,'.');
	price_benzin.value = price_benzin.value.replace(/\,/,'.');
	price_gas.value = price_gas.value.replace(/\,/,'.');
	gas.value = r2(litr.value*1.15);
	var result;
	result = ((km.value/100*litr.value)*price_benzin.value) - ((km.value/100*gas.value)*price_gas.value);
	document.getElementById('result').innerHTML = r2(result)+' EUR';
}


function r2(n){
	ans = n * 1000;
	ans = Math.round(ans /10) + "";
	while (ans.length < 3) {ans = "0" + ans};
	len = ans.length;
	ans = ans.substring(0,len-2) + "." + ans.substring(len-2,len);
	return ans;
}