function loadBar(fl)
//fl is show/hide flag
{
  var x,y;
  if (self.innerHeight)
  {// all except Explorer
    x = self.innerWidth;
    y = self.innerHeight;
  }
  else
  if (document.documentElement && document.documentElement.clientHeight)
  { // Explorer 6 Strict Mode
    x = document.documentElement.clientWidth;
    y = document.documentElement.clientHeight;
  }
  else
  if (document.body)
  { // other Explorers
    x = document.body.clientWidth;
    y = document.body.clientHeight;
  }

  var el=document.getElementById('loader');

  if(null!=el) {
    var top = (y/2) - 50;
    var left = (x/2) - 150;
    if( left<=0 ) left = 10;
    el.style.visibility = (fl==1)?'visible':'hidden';
    el.style.display = (fl==1)?'block':'none';
    el.style.left = left + "px"
    el.style.top = top + "px";
    el.style.zIndex = 2;
  }
}