function changeTextSize(size){
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet('normal');
  if (size == 'down'){
    switch (title) {
        case '14text': setActiveStyleSheet('normal'); break;
        case 'normal': setActiveStyleSheet('10text'); break;
        case 'null'  : setActiveStyleSheet('10text'); break;
    }    
  } else if (size == 'up') {
    switch (title) {
        case '10text': setActiveStyleSheet('normal'); break;
        case 'normal': setActiveStyleSheet('14text'); break;
        case 'null'  : setActiveStyleSheet('14text'); break;
    }      
  } else if (size == 'normal') {
        setActiveStyleSheet('normal');
  }
}

function setActiveStyleSheet(title) {
    var i, a, main;
    createCookie("style", title, 365);
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
            a.disabled = true;
            if(a.getAttribute("title") == 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){
        alert(a.getAttribute("title"));
        return a.getAttribute("title");
    } 
  }
  return null;
}

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

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+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;
}
/*
window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}
*/
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);