function closeLoader(){
  
  loading_mask = document.getElementById("loading") ;
  body = document.getElementsByTagName("body")[0] ;
  setTimeout("body.removeChild(loading_mask)",50) ;
}

window.onload = function() {
  
  body = document.getElementsByTagName("body")[0] ;
  
  //loading mask
  loading_mask = document.createElement("div") ;
  loading_mask.setAttribute("id","loading") ;
  
  //loader animation
  loader = document.createElement("img") ;
  loader.setAttribute("src","/img/loader.gif") ;
  loading_mask.appendChild(loader) ;
  
  body.appendChild(loading_mask) ;
}