//style Sheet Functions=========================================================
//==============================================================================
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;
}

//General Functions=============================================================
//==============================================================================
var backgrounds = new Array();
	backgrounds[0] = "http://www.vabio.org/wp-content/themes/VaBio/images/masthead01.jpg";
	backgrounds[1] = "http://www.vabio.org/wp-content/themes/VaBio/images/masthead02.jpg";

var delay = 7
var times = 5

function crossFade(c) {
	var divs = c.getElementsByTagName('div');

	bottom = divs[0];
	topp = divs[1];
	
	for(var i = 0; i < times; i ++) {
		fadeOut(topp, bottom);
		fadeIn(topp, bottom);
	}
}
function fadeOut(t, b) {
	new Effect.Opacity(t.id,
		{ duration: 2.0, 
		transition: Effect.Transitions.linear, 
		from: 1.0, to: 0,
		delay: delay,
		queue: 'end',
		afterFinish: function () {getNewClass(t);}
		});	
}
function fadeIn(t, b) {
		new Effect.Opacity(t.id,
		{ duration: 2.0, 
		transition: Effect.Transitions.linear, 
		from: 0, to: 1.0,
		delay: delay,
		queue: 'end',
		afterFinish: function () {getNewClass(b);}		
		});
}
function getNewClass(e) {
	var rand = Math.round(10*Math.random()) % 2;
	e.style.backgroundImage = "url(" + backgrounds[rand] + ")";
}


function checkform ( form )
{

  if (form.fEmail.value == "") {
    alert( "Please enter your email address." );
    form.fEmail.focus();
    return false ;
  }
  return true ;
}

//Behaviour rules===============================================================
//==============================================================================
/*
	var myrules = {
		
		'a' : function(element){
			element.onclick = function(){
				console.log('dude');
				
				return false;
			}
		},
		'.styleDefault' : function(element){
			element.onclick = function(){
				setActiveStyleSheet('default');
				
				return false;
			}
		},
		'.styleLarge' : function(element){
			element.onclick = function(){
				setActiveStyleSheet('Large Type');
				
				return false;
			}
		},
		'.styleHC' : function(element){
			element.onclick = function(){
				setActiveStyleSheet('High Contrast');
				
				return false;
			}
		}
	};
	Behaviour.register(myrules);
		
	Behaviour.addLoadEvent(function() { 
		var cookie = readCookie("style");
		var title = cookie ? cookie : getPreferredStyleSheet();
		setActiveStyleSheet(title);
	
		//crossFade($('mastheadContainer'));
	});	*/
	
Event.addBehavior({
	'.styleDefault:click' : function(e) {
		setActiveStyleSheet('default');
		
		return false;
	},
	'.styleLarge:click' : function(e) {
		setActiveStyleSheet('Large Type');
		
		return false;
	},
	'.styleHC:click' : function(e) {
		setActiveStyleSheet('High Contrast');
		
		return false;
	}	
});	

//General ======================================================================
//==============================================================================
	window.onunload = function(e) {
		var title = getActiveStyleSheet();
		createCookie("style", title, 365);
	}

	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);