// Style Sheet Switcher functions written by Paul Sowden for an article on A List Apart - http://www.alistapart.com/articles/alternate
function setActiveStyleSheet(title,theClass) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && a.className==theClass) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

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

function getPreferredStyleSheet(theClass) {
  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") && a.className == theClass
       ) 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) {
 // get text style cookie
 var cookie = readCookie("text");
 var title = cookie ? cookie : getPreferredStyleSheet("text");
 setActiveStyleSheet(title, "text");
 //get layout style cookie
 var cookie = readCookie("layout");
 var title = cookie ? cookie : getPreferredStyleSheet("layout");
 setActiveStyleSheet(title, "layout");
}

window.onunload = function(e) {
	var title = getActiveStyleSheet("text");
	createCookie("text", title, 365);
	var title = getActiveStyleSheet("layout");
	createCookie("layout", title, 365);
}
window.onload();