// JavaScript Document

/**/
a1 = 'a1';
a1_off = new Image(); a1_off.src ="/image/btn_a1_off.gif";
a1_on = new Image(); a1_on.src ="/image/btn_a1_on.gif";
a2 = 'a2';
a2_off = new Image(); a2_off.src ="/image/btn_a2_off.gif";
a2_on = new Image(); a2_on.src ="/image/btn_a2_on.gif";
a3 = 'a3';
a3_off = new Image(); a3_off.src ="/image/btn_a3_off.gif";
a3_on = new Image(); a3_on.src ="/image/btn_a3_on.gif";
/**/

/* Determines the browser name and browser version */
var docObj;
var brow = ((navigator.appName));
var verStr=navigator.appVersion, app=navigator.appName, version = parseFloat(verStr);
var agt=navigator.userAgent.toLowerCase();
var is_mac =  (agt.indexOf("mac")!=-1);
/* reassign variable depending on the browser */
var nav = false;
var iex = false;
if (brow == "Netscape") {nav = true;}
else if (brow == "Microsoft Internet Explorer") {iex = true;}
else if (brow.indexOf(0) == "M") {iex = true;}
else {
	nav = false;
	iex = false;
}
if (iex){
	docObj = 'document.all';
	nav = false;
}
if (nav){
	docObj = 'document';
	nav = true;
}
/**/

/**/
function swapImage(title) {
	wtImage = new Image();
	imgName1 = eval(docObj+'.'+a1);
	imgName2 = eval(docObj+'.'+a2);
	imgName3 = eval(docObj+'.'+a3);	
	if(imgName1 && imgName2 && imgName3) {
		switch(title) {
		case 'A-':
			imgName1.src = a1_on.src;	
			imgName2.src = a2_off.src;
			imgName3.src = a3_off.src;
			break;
		case 'A':
			imgName1.src = a1_on.src;	
			imgName2.src = a2_off.src;
			imgName3.src = a3_off.src;
			wtImage.src = '/image/wt_font_small.gif';
			break;
		case 'A+':
			imgName1.src = a1_off.src;	
			imgName2.src = a2_on.src;
			imgName3.src = a3_off.src;
			wtImage.src = '/image/wt_font_medium.gif';
			break;
		case 'A++':
			imgName1.src = a1_off.src;	
			imgName2.src = a2_off.src;
			imgName3.src = a3_on.src;
			wtImage.src = '/image/wt_font_large.gif';
			break;
		default:
			imgName1.src = a1_on.src;	
			imgName2.src = a2_off.src;
			imgName3.src = a3_off.src;
		}
	}
}
/**/

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;
    }
  }
	swapImage(title);
}

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() {
  return ('A-');
}

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);