//*****************************************************************************
// Do not remove this notice.
//
// Copyright 2001 by Mike Hall.
// See http://www.brainjar.com for terms of use.
//*****************************************************************************

// Determine browser and version.

function Browser() {

  var ua, s, i;

  this.isIE    = false;
  this.isNS    = false;
  this.version = null;
  // this.isOpera = (navigator.userAgent.indexOf("Opera 20")!=-1); //opera verbieden te spoofen, maar hoe?

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  // Treat any other "Gecko" browser as NS 6.1.

  s = "Mozilla";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;
  }
}

var browser = new Browser();

// Global object to hold drag information.

var dragObj = new Object();
dragObj.zIndex = 0;

function dragStart(event, id) {

  var el;
  var x, y;

  // If an element id was given, find it. Otherwise use the element being
  // clicked on.

  if (id)
    dragObj.elNode = document.getElementById(id);
  else {
    if (browser.isIE)
      dragObj.elNode = window.event.srcElement;
    if (browser.isNS)
      dragObj.elNode = event.target;

    // If this is a text node, use its parent element.

    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;
  }

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Save starting positions of cursor and element.

  dragObj.cursorStartX = x;
  dragObj.cursorStartY = y;
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);

  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0;

  // Update element's z-index.

  dragObj.elNode.style.zIndex = 98;

  // Capture mousemove and mouseup events on the page.

  if (browser.isIE) {
    document.attachEvent("onmousemove", dragGo);
    document.attachEvent("onmouseup",   dragStop);
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS) {
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    event.preventDefault();
  }
}

function dragGo(event) {

  var x, y;

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Move drag element by the same amount the cursor has moved.

  dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
  dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px";

  if (browser.isIE) {
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS)
    event.preventDefault();
}

function dragStop(event) {

  // Stop capturing mousemove and mouseup events.

  if (browser.isIE) {
    document.detachEvent("onmousemove", dragGo);
    document.detachEvent("onmouseup",   dragStop);
  }
  if (browser.isNS) {
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
  }
}

  if (browser.isNS || browser.isIE) {
  document.getElementById("boxD").onmousedown = function()
  {
    {
    var grijp = document.getElementById("tip") 
    show_uitleg(grijp.getAttribute("title"));
    }
  function show_uitleg(uitleg)
    {
    if (screen.width>=600)
      {
      var doel = document.getElementById("jo");
      doel.innerHTML = uitleg;
      doel.style.color = '#513';
      }
    }
  }
}

  if (browser.isNS || browser.isIE) {
  document.getElementById("tekst_trug").onmouseout = function()
  {
    {
    var grijpb = document.getElementById("trug_jo") 
    hide_uitleg(grijpb.getAttribute("title"));
    }
  function hide_uitleg(uitleg)
    {
    if (screen.width>=600)
      {
      var doel = document.getElementById("jo");
      doel.innerHTML = uitleg;
      doel.style.color = '#222';
      }
    }
  }
}

  if (browser.isNS || browser.isIE) {
  function show_opacity()
  {
    document.getElementById("boxD").style.opacity = '0.85';
    document.getElementById("boxD").style.filter= 'alpha(opacity=85)';
    }
  }
  if (browser.isNS || browser.isIE) {
  function hide_opacity()
  {
    document.getElementById("boxD").style.opacity = '1';
    document.getElementById("boxD").style.filter= 'alpha(opacity=100)';
    }
  }

if (browser.isIE) {
if( screen.width < 840 ){
    document.getElementById("boxD").style.top = 5.5 + 'em';
    document.getElementById("boxD").style.left = 9 + 'em';
}
}
if (browser.isNS) {
if( screen.width < 840 ){
    document.getElementById("boxD").style.top = 24 + 'em';
    document.getElementById("boxD").style.left = 10 + '%';
}
}