function handleArrowKeys(e) {
	try {
		var e = window.event || e
		var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0;
		
		if (key == 37 || key == 39) {
			if (key == 37) {
				//leva
				if (levaUrl != "") window.location = levaUrl;
			}
			if (key == 39) {
				//prava;
				if (pravaUrl != "") window.location = pravaUrl;
			}
			event.returnValue = false;
		}
	} catch (Exception) {
		return false;
	}
}