function newColor(idCell,idA) {
eval('document.getElementById("' + idCell + '").style.background = "#000000"');
eval('document.getElementById("' + idA + '").style.color = "#ffffff"');
}

function backColor(idCell,idA) {
eval('document.getElementById("' + idCell + '").style.background = "#ffffff"');
eval('document.getElementById("' + idA + '").style.color = "#000000"');
}