/* Style Switcher by Paul Sowden, see A List Apart: http://www.alistapart.com/articles/alternate/ */

function setActiveStyleSheet(title) {
  var i, j, a, main, path="";
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("title").indexOf("main") != -1) {
		main = a.getAttribute("href");
		for(j=0;j<main.indexOf("common")/3;j++) {
			path = path + "../";
		}
		break;
    }
  }
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("alternate style") != -1) {
		if ( document.getElementById("img_small") != null ) { document.getElementById("img_small").setAttribute("src",path+"common/images/ico_fontsize_02.gif"); }
		if ( document.getElementById("img_default") != null ) { document.getElementById("img_default").setAttribute("src",path+"common/images/ico_fontsize_03.gif"); }
		if ( document.getElementById("img_large") != null ) { document.getElementById("img_large").setAttribute("src",path+"common/images/ico_fontsize_04.gif"); }
		if( title == "small" ){
			a.setAttribute("href",path+"common/css/swicher1.css");
			a.setAttribute("title","small");
			if ( document.getElementById("img_small") != null ) { document.getElementById("img_small").setAttribute("src",path+"common/images/ico_fontsize_active02.gif"); }
		}
		if( title == "default" ){
			a.setAttribute("href",path+"common/css/swicher2.css");
			a.setAttribute("title","default");
			if ( document.getElementById("img_default") != null ) { document.getElementById("img_default").setAttribute("src",path+"common/images/ico_fontsize_active03.gif"); }
		}
		if( title == "large" ){
			a.setAttribute("href",path+"common/css/swicher3.css");
			a.setAttribute("title","large");
			if ( document.getElementById("img_large") != null ) { document.getElementById("img_large").setAttribute("src",path+"common/images/ico_fontsize_active04.gif"); }
		}
		a.disabled = true;
		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("alternate") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return "default";
}

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);