/*
 * styleswitcher.js: written by
 * 	Peter-Paul Koch		[http://www.quirksmode.org/]
 *   and
 *	Sowden			[http://idontsmoke.co.uk/]
 *
 *
 * Some modifications made by J. Javier Maestro <jjmaestro@computer.org>
 */


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

	return 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) 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;
}

function deleteCookie(name) {
  var nameEQ = name + "=";
}

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

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  
  // By JJ: This sorts of creates a "permanent" cookie
  //createCookie("style", title, 365);

  // By JJ: This creates a session cookie ("negative time")
  createCookie("style", title, -1);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);