// javascript copyright by lorenz textor

var images = new Array();

function preloadImages(imagePrefix)
{
    images[0] = new Image();
    images[0].src = "/images/"+imagePrefix+"_l.jpg";
    for(i=1; i<5; i++) {
        images[i] = new Image();
        images[i].src = "/images/"+imagePrefix+"_s"+i+"_l.jpg";
    }

    // general onload functions
    var cookie = readCookie("style");
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
    externalLinks();
}

function changeImage(i)
{
    document.getElementById("image_large").src=images[i].src;
}


// javascript copyright by andreas textor

// links to open in a new window (<a href="" rel="external">)

function externalLinks()
{
	if(!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for(var i=0;i<anchors.length;i++)
	{
		var anchor = anchors[i];
		if(anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
			anchor.target = "_blank";
	}
}

//window.onload = externalLinks;


// style sheet switcher

function setActiveStyleSheet(title) {
  var i, a, main;
  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) 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);
//  externalLinks();
//}

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

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