// For the details, visit ALA:
// http://www.alistapart.com/stories/alternate/

function text(title) {
    oldsize = document.getElementById("all").className;
    document.getElementById(oldsize).className = "";
    document.getElementById("all").className = title;
    document.getElementById(title).className = "active";
    createCookie("soc_textsize", title, 365);
}

function getActiveTextSize() {
    title = document.getElementById("all").className;
    if(title) {
        return title;
    } else {
        return "small";
    }
}

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+"; domain=usc.edu; 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 loadtextsize() {
var cookie = readCookie("soc_textsize");
var title = cookie ? cookie : "small";
text(title);
}

window.onunload = function(e) {
  var title = getActiveTextSize();
  createCookie("soc_textsize", title, 365);
}