resize font size

function resetCurrentsize() {
  currentSize = 13;
  if(strLocalization == "JP") {
 if(typeof(fontOverride) == "undefined") {
  currentSize = 16;
 } else {
  currentSize = fontOverride;
 }
  }
  if(strLocalization == "CN") {
  if(typeof(fontOverride) == "undefined") {
  currentSize = 14;
 } else {
  currentSize = fontOverride;
 }
  }
  if (typeof(preDefaultSize) != "undefined") {
   currentSize = preDefaultSize;
  }
  document.getElementById("CurrentSize").value = currentSize;
  if (document.getElementById) {
   document.getElementById("resizeableText").style.cssText = "font-size:"+currentSize+"px";   
  }
}

function sizeDown() {
  if (document.getElementById) {
    currentSize--;
    document.getElementById("CurrentSize").value = currentSize;
    document.getElementById("resizeableText").style.cssText = "font-size:"+currentSize+"px";
  }
}

function sizeUp() {
  if (document.getElementById) {
    currentSize++;
    document.getElementById("CurrentSize").value = currentSize;
    document.getElementById("resizeableText").style.cssText = "font-size:"+currentSize+"px";
  }
}