[aleks_lv]

все нашел

function io()
{ var table = document.getElementById('day');
var trList= table.getElementsByTagName('tr');
for (var i=0;i<trList.length;i++)
{
  var tdList = trList[i].getElementsByTagName('td');

  for (j=0;j<tdList.length;j++)
  {  tdList[j].style.color='#FF0000'

  }
}
}