Edit in JSFiddle

var center = SMap.Coords.fromWGS84(14.41790, 50.12655);
var m = new SMap(JAK.gel("m"), center, 13);
m.addDefaultLayer(SMap.DEF_BASE).enable();
m.addDefaultControls();
m.addDefaultContextMenu();
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <script type="text/javascript" src="https://api.mapy.cz/loader.js"></script>
    <script type="text/javascript">Loader.load();</script>
</head>

<body>
    <div id="m" style="height:380px"></div>
</body>
</html>