function createCanvas() {
	board = document.getElementById("board")
	for (var i in range(70)) {
		tr = board.insertRow(0)
		for (var i in range(80)) {
			td = tr.insertCell(0)
			td.id="drawn"
		}
	}
}

function color() {
  this.style.backgroundColor = "orange";
}

document.getElementById("drawn").addEventListener("click", color, false);