/*
Thanks to Jeffrey Zeldman (zeldman.com) for this wonderful stylesheet switcher
Adjusted it a little to stop from throwing errors in browsers that don't support
the document.getElementsByTagName method (IE/Netscape 4)
*/

// switch styles

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

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

function getPreferredStyleSheet() {
	if (document.getElementsByTagName) {
	  var i, a;
	  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	    if (a.getAttribute("rel") &&
	        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) {
  if (document.getElementsByTagName) {
    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);