/**
 * Sets a Cookie with the given name and value.
 */
function chgFontSize_setCookie(name, value, expires, path, domain, secure) {
  document.cookie = name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

/**
 * Gets the value of the specified cookie.
 */
function chgFontSize_getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else {
    begin += 2;
  }
  var end = document.cookie.indexOf(";", begin);
  if (end == -1) {
    end = dc.length;
  }
  return unescape(dc.substring(begin + prefix.length, end));
}

/**
 * Deletes a Cookie with the given name.
 */
function chgFontSize_deleteCookie(name, path, domain) {
  if (chgFontSize_getCookie(name)) {
    document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}

/*
 * This is needed for the cookie functions.
 *
 * @see http://www.webreference.com/js/column8/functions.html
 */
function chgFontSize_fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0)
    date.setTime(date.getTime() - skew);
}

/**
 * Displays the font size options.
 */
function chgFontSize_display(display_text, display_image, display_steps, display_restore) {
  if (display_text == 'on' || display_image == 'on' || display_steps == 'on') {
    document.write('<form id="chgfontsizeoptions">');
    if (display_text == 'on') {
      document.write('<label for="t">Schrift: </label>');
      document.write('<select id="chgfontsizeselection" onChange="chgFontSize_change(this.options[selectedIndex].value);">');
      for (var size = chgfontsize_min_font_size; size <= chgfontsize_max_font_size; size = Math.round((size + chgfontsize_interval_font_size) * 100) / 100) {
        if (Number(size) == Number(chgfontsize_font_size)) {
          document.write('<option value="' + size + '" selected="selected">' + size + ' ' + chgfontsize_units_font_size + '<\/option>');
        } else {
          document.write('<option value="' + size + '">' + size + ' ' + chgfontsize_units_font_size + '<\/option>');
        }
      }
      document.write('<\/select>');
    }
    if (display_restore == 'on') {
      document.write('&nbsp;<a href="javascript:void(0);" onclick="chgFontSize_change(chgfontsize_default_font_size);" title="Schriftgröße: Standard" >Schrift:</a>&nbsp;');
    }
    if (display_image == 'on') {
      if (chgfontsize_font_size > chgfontsize_min_font_size) {
        document.write('&nbsp;<a title = "Schriftgrösse ändern" class="fontsize" href="javascript:void(0);" onclick="chgFontSize_decrease();"><img src="' + chgfontsize_imgdecact.src + '" title="Schrift kleiner" alt="A-" id="chgfontsizeimgdec" /></a>&nbsp;');
      } else {
        document.write('&nbsp;<a title = "Schriftgrösse ändern" class="fontsize" href="javascript:void(0);" onclick="chgFontSize_decrease();"><img src="' + chgfontsize_imgdecdea.src + '" title="Schrift kleiner" alt="A-" id="chgfontsizeimgdec" /></a>&nbsp;');
      }
      if (chgfontsize_font_size < chgfontsize_max_font_size) {
        document.write('&nbsp;<a title = "Schriftgrösse ändern" class="fontsize" href="javascript:void(0);" onclick="chgFontSize_increase();"><img src="' + chgfontsize_imgincact.src + '" title="Schrift größer" alt="A+" id="chgfontsizeimginc" /></a>&nbsp;');
      } else {
        document.write('&nbsp;<a title = "Schriftgrösse ändern" class="fontsize" href="javascript:void(0);" onclick="chgFontSize_increase();"><img src="' + chgfontsize_imgincdea.src + '" title="Schrift größer" alt="A+" id="chgfontsizeimginc" /></a>&nbsp;');
      }
    }
    if (display_steps == 'on') {
      for (var size = chgfontsize_min_font_size; size <= chgfontsize_max_font_size; size = Math.round((size + chgfontsize_interval_font_size) * 100) / 100) {
        document.write('<a href="javascript:chgFontSize_change('+size+')" style="font-size:' + size + chgfontsize_units_font_size + '">A</a> ');
      }
    }
    
    document.write('<\/form>');
  }
}


/**
 * Change the font size with the given  value.
 */
function chgFontSize_change(fontsize) {
  chgfontsize_font_size = Number(fontsize);
  chgFontSize();
}

/**
 * Decrease the font size.
 */
function chgFontSize_decrease() {
  if (chgfontsize_font_size > chgfontsize_min_font_size) {
    chgfontsize_font_size = Math.round((chgfontsize_font_size - chgfontsize_interval_font_size) * 100) / 100;
    chgFontSize();
  }
}

/**
 * Increase the font size.
 */
function chgFontSize_increase() {
  if (chgfontsize_font_size < chgfontsize_max_font_size) {
    chgfontsize_font_size = Math.round((chgfontsize_font_size + chgfontsize_interval_font_size) * 100) / 100;
    chgFontSize();
  }
}

/**
 * Changes the font size and sets the cookie.
 */
function chgFontSize() {
  var now = new Date();
  chgFontSize_fixDate(now);
  now.setTime(now.getTime() + 365 * 24 * 60 * 60 * 1000); //expire in a year
  chgFontSize_setCookie('wp-chgfontsize', chgfontsize_font_size, now, '/', '', '');
  chgFontSize_setCookie('wp-chgfontsize-units', chgfontsize_units_font_size, now, '/', '', '');
  var divArray = document.getElementsByTagName("div");
  for (var i = 0; i < divArray.length; i++) {
    if (divArray.item(i).getAttribute("id") == chgfontsize_element) { 
      divArray.item(i).style.fontSize = Number(chgfontsize_font_size) + chgfontsize_units_font_size;
    }
    if (divArray.item(i).className == chgfontsize_element) { 
      divArray.item(i).style.fontSize = Number(chgfontsize_font_size) + chgfontsize_units_font_size;
    }
  }
  var fsselection = document.getElementById('chgfontsizeselection');
  if (fsselection != null) {
    selectionIndex = Math.round(((chgfontsize_font_size - chgfontsize_min_font_size) / chgfontsize_interval_font_size) * 100) / 100;
    fsselection.selectedIndex = selectionIndex;
  }
  var imgdec = document.getElementById('chgfontsizeimgdec');
  if (imgdec != null) {
    if (chgfontsize_font_size > chgfontsize_min_font_size) {
      imgdec.src = chgfontsize_imgdecact.src;
    } else {
      imgdec.src = chgfontsize_imgdecdea.src;
    }
  }
  var imginc = document.getElementById('chgfontsizeimginc');
  if (imginc != null) {
    if (chgfontsize_font_size < chgfontsize_max_font_size) {
      imginc.src = chgfontsize_imgincact.src;
    } else {
      imginc.src = chgfontsize_imgincdea.src;
    }
  }
}

var chgfontsize_element = null;
var chgfontsize_min_font_size = null;
var chgfontsize_max_font_size = null;
var chgfontsize_interval_font_size = null;
var chgfontsize_units_font_size = null;
var chgfontsize_default_font_size = null;
var chgfontsize_font_size = null;