function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\\\s)"+searchClass+"(\\\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function increase(name) {
  var value = document.getElementById(name).value;
  if (left() > 0) {
    document.getElementById(name).value = ++value;
    updateleft();
  }
}

function decrease(name) {
  var value = document.getElementById(name).value;
  if (value > 0) {
    document.getElementById(name).value = --value;
    updateleft();
  }
}

function updateleft() {
  document.getElementById('intotal').value = left();
}

function left() {
  var sofar = 0;
  var names = new Array("food", "reproduction", "defense", "stealing");
  for (x in names) {
    sofar += parseInt(document.getElementById(names[x]).value);
  }
  var fleft = document.getElementById('fuyts').value - sofar;
  return fleft;
}

function highlight(player, hlite) {
  var curplayer = document.getElementsByName(player);

  for (var i=0; i < curplayer.length; i++) {
    if (hlite) curplayer[i].style.backgroundColor = highlite(true);
    else curplayer[i].style.backgroundColor = highlite(false);
  }
}

function highlite(hlited) {
  var style = getActiveStyleSheet();
  if (style == 'yellow-black') {
    if (hlited) return '#444';
    else return '#222';
  }
  else if (style == 'fresh-green') {
    if (hlited) return '#EE3';
    else return '#FFD';
  }
  else if (style == 'leathergreen') {
    if (hlited) return '#F5F4D7';
    else return '#E0DFB1';
  }
}

// stylesheets

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;
}

// style storage

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);