var kurz = 30.1260;

function openCalculator() {
if (!document.getElementById("calculator"))
{
	document.getElementById('calc').style.display = 'block';
	}
}

function recalculate(){
cenaEUR = document.getElementById('cenaC').value;
cenaEUR = cenaEUR.replace(/,/, '.');
cena = parseFloat(cenaEUR);
if (isNaN(cena)) {cena = 0;}
cenaN = cena * kurz;
cenaN = Math.round(cenaN * 100)/100;

document.getElementById('cenaSum').innerHTML = 'SKK ' + cenaN;
}

function removeCalculator() {
	document.getElementById('calc').style.display = 'none';
}

function toggle(obj) {
    var el = document.getElementById(obj);
    if (el.style.display != 'none') {
        el.style.display = 'none';
    }
    else {
        el.style.display = '';
    }
}