function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && a.getAttribute("title")!='screen') {
      a.disabled = true;
      var titleAttribute = a.getAttribute("title");
      if(titleAttribute !='screen' && titleAttribute == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled && a.getAttribute("title")!='screen')
      return a.getAttribute("title");
  }
  return null;
}

function ChangeTextSize() 
{
    if (getActiveStyleSheet()=='normal') 
        setActiveStyleSheet('large');
    else
        setActiveStyleSheet('normal');
}
setActiveStyleSheet('normal');