var todayColor = "red";

// Color for yesterday
var yesterColor = "blue";

var iCell = document.getElementsByTagName("td");

for(c = 0; c < iCell.length; c ++){
    if(iCell.item(c).className == "windowbg2" && iCell.item(c).width.match(/^2(0|4)%/)){
       if(iCell.item(c).firstChild.innerHTML.match(/(Today|Yesterday)/)){
          switch(RegExp.$1){
             case "Today" :
                 iCell.item(c).firstChild.getElementsByTagName("b").item(0).style.color = todayColor;
                break;
             case "Yesterday" :
                 iCell.item(c).firstChild.innerHTML = iCell.item(c).firstChild.innerHTML.replace(/(Yesterday)/, "<span style='color: " + yesterColor + "'>$1</span>");
                 break;
          }
       }
    }
}