// toggle visibility

function toggle( targetId ){
  if (document.getElementById){
  		target = document.getElementById( targetId );
  			if (target.style.display == "none"){
  				target.style.display = "";
  			} else {
  				target.style.display = "none";
  			}
  	}
}



// toggle visibility with image change

var isDHTML=0;
var isID=0;
var isAll=0;
var isLayers=0;
var plus_image = new Image();
var minus_image = new Image();
plus_image.src = "/img/plus.gif";
minus_image.src = "/img/minus.gif";


if (document.getElementById) {isID = 1; isDHTML = 1;}

{
if (document.all) {isAll = 1; isDHTML = 1;}
else {browserVersion=parseInt(navigator.appVersion);
      if ((navigator.appName.indexOf('Netscape') != -1) && (browserVersion==4)) {isLayers=1; isDHTML=1;}}
}
function toggleIt(name) {
if (isID) {var x = document.getElementById(name).style; }
else 
{ if (isAll) { var x = document.all[name].style; } 
else
{ if (isLayers) { var x = document.layers[name].style ; }
}
}
if (x.display == 'block') {
x.display = 'none';
document.images[name + '_img'].src = '/img/plus.gif';
} else {
x.display = 'block';
document.images[name + '_img'].src = '/img/minus.gif';
}
}



// switch styles

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);