sel=1
function ON(num) 
{
document.getElementById("cell" + num).bgColor = "#FFFFFF";
//document.getElementById("cell" + (num + 1)).bgColor = "#00ff00";
}
function OFF(num) {
document.getElementById("cell" + num).bgColor = "#FFFFFF";
//document.getElementById("cell" + (num + 1)).bgColor = "#ffffff";
}