Generate a sudoku game

sudoku.js

var sudoku = [], iterationCount = 0;

function check(type, pos, num) {
	var bool = false;

	for(var i = 0; i < 9; i++) {

		var tile = (type === 1) ? (pos * 9) + i : //row
				   (type === 2) ? (i * 9) + pos : null; //Column
				   (((((pos - (pos % 3))/3) * 3)) * 9) + ((((pos % 3) * 3)) + (i % 3)); //Quadrant

		iterationCount++;
		
		if(sudoku[tile] == num) return false;
		else bool = true;
	}	

	return bool;
}

for(var y = 0; y < 9; y++)
	for(var x = 0; x < 9; x++) {
		for(var i = 0; i < 9; i++) {
			var tile = (y*9) + x,
				num = i + 1;
			if(check(1, y, num) && check(2, x, num) && check(3, ((y % 3) * 3) + (x % 3), num)) {
				sudoku[tile] = num;
			}
		}

		if(!sudoku[tile]) sudoku[tile] = "null";
	}