var customFontSize = 11;

function sb_text_onload() {
 var size;
 customFontSize = parseInt(getStyle(document.body, 'font-size'));
 if(size = getCookie("font_size")) {
  document.body.style.fontSize = size;
 }
}

function sb_text_zoom(size) {
 if (size == null) {
  document.body.style.fontSize = null;
  deleteCookie("font_size");
 }
 else {
  document.body.style.fontSize = size;
  setCookie("font_size", size);
 }
}