function IluminarFila(f){
f.style.backgroundImage='url(imagenes/papel.jpg)';
for (c=0;c<f.cells.length;c++)f.cells[c].style.backgroundImage='url(imagenes/papel.jpg)';
//f.bgColor='#f0d0a0';
}

function DesiluminarFila(f){
f.style.backgroundImage='';
for (c=0;c<f.cells.length;c++)f.cells[c].style.backgroundImage='';
//f.bgColor='';
}