/* for fontsize change --------------------------------------------------------*/
function change_size( ratio ) {
	if ( 40 < parseInt( def_size ) && parseInt( ratio ) < 0 ) {
		def_size = parseInt( def_size ) + parseInt( ratio );
	}
	if ( 0 < parseInt( ratio ) && parseInt( def_size ) < 250 ) {
		def_size = parseInt( def_size ) + parseInt( ratio );
	}
	document.body.style.fontSize = def_size + '%';
}

/* for stylesheet change ------------------------------------------------------*/
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 setActiveStyleSheet(title) {
  var i, a, main;
  if ( title == '' || title == null ) {
    title = 'normal';
  }
  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);

/* for event ------------------------------------------------------------------*/

var cookie;
var title;
var currentYear;
var currentMonth;
var currentDay;
var def_size;
var ratio;

window.onload = function(e) {
  cookie   = readCookie("fontSize");
  def_size = cookie ? cookie : 100;
  change_size ( 0 );
  cookie    = readCookie("style");
  title = cookie ? cookie : 'normal';
  setActiveStyleSheet(title);
}

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