function checkInput(object) {
		if (object.value == "")
			return;
		if (object.value > "9" || object.value < "1") {
			alert("Vkladajte len čísla 1 až 9");
			object.value = "";
		}
	}
	
function check() {
	var message = document.getElementById('message');
	for (var row = 0; row < 9; row++) {
		var tmp = [];
		for (var col = 0; col < 9; col++) {
			var value = document.getElementById("item"+row+"_"+col).value;
			if (value == "") {
				message.style.color = "red";
				message.innerHTML = 'Riešenie nie je úplné';
        			return;	
			} else if (tmp.indexOf(value) != -1) {
				message.style.color = "red";
        			message.innerHTML = 'Riešenie nie je správne';
        			return;
			} else {
				tmp[col] = value;
			}
		}
	}
	for (var col = 0; col < 9; col++) {
		var tmp = [];
		for (var row = 0; row < 9; row++) {
			var value = document.getElementById("item"+row+"_"+col).value;
			if (value == "") {
				message.style.color = "red";
				message.innerHTML = 'Riešenie nie je úplné';
        			return;
      			} else if (tmp.indexOf(value) != -1) {
				message.style.color = "red";
        			message.innerHTML = 'Riešenie nie je správne';
        			return;
			} else {
				tmp[col] = value;
			}
		}			
	}
	message.style.color = "green";
	message.innerHTML = "Riešenie je správne";
}

function solution(id) {	
	window.open('/solutionSudoku.php?id='+id, '', 'location=0,status=0,scrollbars=0,width=400,height=400');
}

function newSudoku() {
	var difficulty = document.getElementById('difficulty').value;
	location.href="/sk/sudoku/"+difficulty+"/";
}

function printSudoku() {
	window.print();
}

function showHelp(category) {
	window.open('/help/pomoc-krizovky.html#'+category, '', 'location=0,status=0,scrollbars=1,width=600,height=600');
}