function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name + "=" + (value ? value : "") + expires + "; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

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

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

function fontsizeup() {
  var title;
  var active = getActiveStyleSheet();
  switch (active) {
    case 'A-' :
      title = 'A';
      break;
    case 'A' :
      title = 'A+';
      break;
    default :
      title = 'A+';
      break;
  }
  setActiveStyleSheet(title);
  createCookie("style", title, null);
}

function fontsizedown() {
  var title;
  var active = getActiveStyleSheet();
  switch (active) {
    case 'A+' :
      title = 'A';
      break;
    case 'A' :
      title = 'A-';
      break;
    default :
      title = 'A-';
      break;
  }
  setActiveStyleSheet(title);
  createCookie("style", title, null);
}

function getPreferredStyleSheet() {
  return ('A-');
}

function applySavedStylesheet() {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

applySavedStylesheet();