var divFundo;
var divConteudo;
var divFechar;
var iFrame;

function abrirVideo() {
  divFundo = document.createElement('div');
  divFundo.setAttribute('id', 'wDivFundo');

  divConteudo = document.createElement('div');
  divConteudo.setAttribute('id', 'wDivConteudo');
  divConteudo.style.height = (document.documentElement.clientHeight * (75/100))  + 'px';
  divConteudo.style.width = (document.documentElement.clientWidth * (55/100)) + 'px';

  divFechar = document.createElement('div');
  divFechar.setAttribute('id', 'wDivFechar');
  divFechar.onclick = new Function("fecharVideo();");

  iFrame = document.createElement('iframe');
  iFrame.id  = 'wFrame';
  iFrame.setAttribute('src', 'ver_video.php');
  iFrame.setAttribute('name', 'nomedoframe');
  iFrame.setAttribute('frameborder', '0');
  iFrame.setAttribute('marginheight', '0');
  iFrame.setAttribute('marginwidth', '0');
  iFrame.setAttribute('scrolling', 'no');
  iFrame.setAttribute('allowtransparency', 'true');
          
  divConteudo.appendChild(divFechar);
  divConteudo.appendChild(iFrame);
          
  var inBody = document.getElementsByTagName("body").item(0);
  inBody.insertBefore(divFundo, inBody.firstChild);
  inBody.insertBefore(divConteudo, divFundo.nextSibling);	

  divFundo.style.zIndex = '10000';
  divFundo.style.display = 'inline';

  divConteudo.style.zIndex = '10001';
  divConteudo.style.display = 'inline';
  
  setInterval('posicionar()', 20);
}

function posicionar() {
  var x = (document.documentElement.clientWidth - divConteudo.offsetWidth) / 2;
  var y = ((document.documentElement.clientHeight - divConteudo.clientHeight) / 2) + document.documentElement.scrollTop;
  
  divConteudo.style.top = y + 'px';
  divConteudo.style.left = x + 'px';
}

function fecharVideo() {
  document.getElementById('wDivConteudo').style.display = 'none';
  document.getElementById('wDivConteudo').innerHTML = '';
  
  document.getElementById('wDivFundo').style.display = 'none';
}