kurz = 30.126;
mena = '';

function calc_keypress(e, cur) {
	evt = e || window.event;
	keyPressed = evt.which || evt.keyCode;
	
	if(keyPressed == 13)
	  calc_submit(cur);
}

function calc_submit(cur) {
	mena = cur;
	calc_compute();
}

function calc_compute() {
	if(mena == "skk")
		cislo = document.getElementById("calc_sk").value;
	if(mena == "eur")
		cislo = document.getElementById("calc_eur").value;
	
	cislo = cislo.replace(',', '.');
	cislo = cislo.replace(/[^0-9.]*/i, '') + ".0";
	temp = cislo.split(".");
	cislo = temp[0] + "." + temp[1];
	
	if(mena == "skk") {
		hodnota = cislo / kurz;
		document.getElementById("calc_eur").value = Math.round(hodnota * 100) / 100;
	}
	if(mena == "eur") {
		hodnota = cislo * kurz;
		document.getElementById("calc_sk").value = Math.round(hodnota * 100) / 100;
	}
}