function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

/******************** stylesheet 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);
}

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

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



/******************** fontsize switcher *****************************/
function set_cookie(name,value) {
    expire_date = new Date();
    in_one_year = expire_date.getTime() + (365 * 24 * 60 * 60 * 1000);
    expire_date.setTime(in_one_year);
    document.cookie = name + "=" + value + "; expires=" + expire_date.toGMTString() + ";path=/;";
}

function read_cookie_value(cookie_name) {
    if(document.cookie.match(cookie_name)) {
        cookie_name_length = cookie_name.length;
        var cookie_position = document.cookie.indexOf(cookie_name);
        var start_value_reading = cookie_position + cookie_name_length + 1;
        var interim_value = document.cookie.substr(start_value_reading);
        var position_next_separator = interim_value.indexOf(";");

        if(position_next_separator != "-1") {
            var stop_value_reading = position_next_separator;
            var cookie_value = document.cookie.substr(start_value_reading,stop_value_reading);
        } else {
            var cookie_value = document.cookie.substr(start_value_reading);
        }
        return cookie_value;
    }
}
 
function change_body_font(span) {
    font_size = span.substr(5,7);
    new_font_size = font_size.replace("_",".");
    set_cookie("accessibility_font_size",new_font_size);
    location.reload();
}

function show_font_switcher() {
    document.write("<div id=\"font_switcher\">");
    document.write("<ul>");
    document.write("<li><dfn class=\"menu\">1:<\/dfn><a href=\"javascript:history.go(0)\" id=\"font_0_95\" onclick=\"change_body_font(this.id);\" onkeypress=\"this.onclick\" title=\"kleine Schriftgr&ouml;&szlig;e\">A-<\/a><\/li>");
   	document.write("<li><dfn class=\"menu\">2:<\/dfn><a href=\"javascript:history.go(0)\" id=\"font_1_0\" onclick=\"change_body_font(this.id);\" onkeypress=\"this.onclick\" title=\"normale Schriftgr&ouml;&szlig;e\">A<\/a><\/li>");
    document.write("<li><dfn class=\"menu\">3:<\/dfn><a href=\"javascript:history.go(0)\" id=\"font_1_2\" onclick=\"change_body_font(this.id);\" onkeypress=\"this.onclick\" title=\"gro&szlig;e Schriftgr&ouml;&szlig;e\">A+<\/a><\/li>");
    document.write("<\/ul>");
    document.write("<\/div>");
}

function apply_accessibility_font() {
    cookie_value = read_cookie_value("accessibility_font_size");
    document.getElementById("wrapper").style.fontSize = cookie_value + "em";
}