Siteyi pasif hale getir

<script>
window.onload = function showBox()
  {  
    var width = document.documentElement.clientWidth + document.documentElement.scrollLeft;

    var layer = document.createElement('div');
    layer.style.zIndex = 998;
    layer.id = 'layer';
    layer.style.position = 'absolute';
    layer.style.top = '0px';
    layer.style.left = '0px';
    layer.style.height = document.documentElement.scrollHeight + 'px';
    layer.style.width = width + 'px';
    layer.style.backgroundColor = 'black';
    layer.style.opacity = '.6';
    layer.style.filter += ("progid:DXImageTransform.Microsoft.Alpha(opacity=60)");
    document.body.appendChild(layer);  
    
    var div = document.createElement('div');
    div.style.zIndex = 999;
    div.id = 'box';
    div.style.position = (navigator.userAgent.indexOf('MSIE 6') > -1) ? 'absolute' : 'fixed';
    div.style.top = '200px';
    div.style.left = (width / 2) - (400 / 2) + 'px';	
    div.style.height = '80px';
    div.style.width = '400px';
    div.style.backgroundColor = 'white';
    div.style.border = '2px solid silver';
    div.style.padding = '20px';
    document.body.appendChild(div);  
    
    var p = document.createElement('p');
    p.innerHTML = '<h1 style="color:red;">Site kısa bir süre pasif durumdadır.</h1>';
    div.appendChild(p);
    
    var a = document.createElement('a');
    a.innerHTML = '';
    a.href = 'javascript:void(0)';
    a.onclick = function() 
    {
      document.body.removeChild(document.getElementById('layer'));
      document.body.removeChild(document.getElementById('box'));
    };
      
    div.appendChild(a);
  };


</script>