var num=0;

function setActiveStyleSheet(title, reset) {
  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;
    }
  }
  if (reset == 1) {
    createCookie("wstyle", title, 365);
  }
}

function setStyle() {
  var style = readCookie("wstyle");
  if (style != null) {
    setActiveStyleSheet(style, 0);
  }
}




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=/clubs1;";
}



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;
}

setStyle();

function getCheckedCount() {
    var count = 0; // +1 because element is not really checked yet
    var i     = 0;
    for (var i = 0; i < 8; i++) {
        if (document.getElementById('module' + i).checked) {
            count++;
        }
    }
    return count;
}

function addModule(moduleCount, theUrl, theModule) {
    if(moduleCount == 0) {
        theUrl = "exam_id=" + theModule;
    } else {
        theUrl += "&exam_id" + moduleCount + "=" + theModule;
    }
   return theUrl;
}

function submitForm() {
    if(getCheckedCount() < 1) {
      alert('U moet minimaal 1 examen kiezen');
      return false;
    } else if(getCheckedCount() > 5) {
      alert('U kunt maximaal 5 examens tegelijk boeken.');
      return false;
    } else {
      var i = 0;
      var url = "";
      if(document.getElementById('module0').checked) {
          url = addModule(i,url,document.getElementById('module0').value);
          i++;
      }
      if(document.getElementById('module1').checked) {
          url = addModule(i,url,document.getElementById('module1').value);
          i++;
      }

      if(document.getElementById('module2').checked) {
          url = addModule(i,url,document.getElementById('module2').value);
          i++;
      }
      if(document.getElementById('module3').checked) {
          url = addModule(i,url,document.getElementById('module3').value);
          i++;
      }
      if(document.getElementById('module4').checked) {
          url = addModule(i,url,document.getElementById('module4').value);
          i++;
      }
      if(document.getElementById('module5').checked) {
          url = addModule(i,url,document.getElementById('module5').value);
          i++;
      }
      if(document.getElementById('module6').checked) {
          url = addModule(i,url,document.getElementById('module6').value);
          i++;
      }
      if(document.getElementById('module7').checked) {
          url = addModule(i,url,document.getElementById('module7').value);
          i++;
      }
      window.location = 'http://www.exam-center.com/register/?client_id=WFTNIVO&' + url;
    } 
}