Document Ready

Simplest document ready code. Tested in IE9, Firefox, Chrome.

HTML

<div id="load"></div>

CSS

#load{
    width:100%;
    height:100%;
    position:fixed;
    z-index:9999;
    background:url("https://www.creditmutuel.fr/cmne/fr/banques/webservices/nswr/images/loading.gif") no-repeat center center rgba(0,0,0,0.25)
}

JavaScript

document.onreadystatechange = function () {
  var state = document.readyState
  if (state == 'complete') {
         document.getElementById('interactive');
         document.getElementById('load').style.visibility="hidden";
  }
}