/* helper function to load multiple functions, courtesy Simon Wilson */
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function popup(url,w,h,scroll)
{
  var l = (screen.width-w)/2;
  var t = (screen.height-h)/2;

  window.open(url,'_blank','resizable=yes,location=no,menubar=no,scrollbars='+scroll+',status=no,toolbar=no,fullscreen=no,dependent=no,width='+w+',height='+h+',left='+l+',top='+t);
}

//get basepath
var site_base = "";
if(a=document.getElementsByTagName("link")[0])
{
  site_base = a.href.substr(0,a.href.indexOf('/resources'));
}


window.addEvent('domready', function()
{
  $$('.dropdownlist li').each(function(el)
  {
    el.addEvent('mouseover', function(e) {
      el.addClass('iehover');
    });

    el.addEvent('mouseout', function(e) {
      el.removeClass('iehover');
    });

  });

});


function textboxes()
{
  var fields = [['side_search','q','typ uw trefwoord hier'],['side_login','login_username','uw gebruikersnaam']];
  var obj    = null;

  for(var i=0;i<fields.length;i++)
  {
    if(!document.forms[fields[i][0]] || !document.forms[fields[i][0]].elements[fields[i][1]])
    {
      continue;
    }

    obj=document.forms[fields[i][0]].elements[fields[i][1]];
    obj.onclick = function()
    {
      if(this.value==this.def)
      {
        this.value='';
      }
    }
    obj.onblur = function()
    {
      if(this.value=='')
      {
        this.value=this.def;
      }
    }
    obj.value=fields[i][2];
    obj.def  =fields[i][2];
  }
}

function navHover()
{
  if(document.getElementById("nav"))
  {
    var lis = document.getElementById("nav").getElementsByTagName("LI");
    for (var i=0; i<lis.length; i++)
    {
      lis[i].onmouseover=function()
      {
        this.className+=" iehover";
      }
      lis[i].onmouseout=function()
      {
        this.className=this.className.replace(new RegExp(" iehover\\b"), "");
      }
    }
  }
}

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

  if(document.getElementById("fontbig"))
  {
    document.getElementById("fontbig").style.cursor='hand';
    document.getElementById("fontbig").onclick = function()
    {
      setActiveStyleSheet("bigfont", 1);
    }
  }
  if(document.getElementById("fontsmall"))
  {
    document.getElementById("fontsmall").style.cursor='hand';
    document.getElementById("fontsmall").onclick = function()
    {
      setActiveStyleSheet("", 1);
    }
  }
}

addLoadEvent(function()
{
  textboxes();
  styleSheet();
});

if (window.attachEvent) {window.attachEvent("onload", navHover);}

function reloadValidationImage()
{
  if(document.getElementById('validationimage'))
  {
    var now = new Date();
    newSrc = document.getElementById('validationimage').src
    newSrc = (newSrc.indexOf("?")>0)? newSrc.substr(0,newSrc.indexOf("?")) : newSrc;
    newSrc+= "?"+ now.getTime();
    document.getElementById('validationimage').src = newSrc;
  }
}


/****[HEADERIMAGES]*******/
var imgs = new Asset.images([site_base+'/resources/images/headerimg/0.gif'
                            ,site_base+'/resources/images/headerimg/1.gif'
                            ,site_base+'/resources/images/headerimg/2.gif'
                            ,site_base+'/resources/images/headerimg/3.gif'
                            ,site_base+'/resources/images/headerimg/4.gif'
                            ,site_base+'/resources/images/headerimg/5.gif'
                            ,site_base+'/resources/images/headerimg/6.gif'
                            ,site_base+'/resources/images/headerimg/7.gif'
                            ,site_base+'/resources/images/headerimg/8.gif'
                            ,site_base+'/resources/images/headerimg/9.gif'
                            ,site_base+'/resources/images/headerimg/10.gif'
                            ,site_base+'/resources/images/headerimg/11.gif'
                            ,site_base+'/resources/images/headerimg/12.gif'
                            ,site_base+'/resources/images/headerimg/13.gif']);

addLoadEvent(function(){
  if($('headerdiv0')) //if this one exists.. go on
  {
    (function(){for(i=0;i<12;i++){imgchanger(i,14,Math.floor(Math.random()*14));}}).delay(5000+(Math.random()*13000));
  }
});

function imgchanger(id,num,cur)
{
  $('headerdiv'+id).style.backgroundImage = 'url('+imgs[cur].src+')';
  $('headerimg'+id).fx  = $('headerimg'+id).effect('opacity',{duration: 500}).start(1,0);
  (function(){
      $('headerimg'+id).src = imgs[cur].src;
      $('headerimg'+id).setOpacity(1);}
  ).delay(550);
  (function(){imgchanger(id,num,(Math.floor(Math.random()*num)));}).delay(5000+(Math.random()*13000));
}
/****[/HEADERIMAGES]*******/



/********************[stylesheet]************************/
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.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

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