var height1;
  height1=(document.body.offsetWidth-950)/2;
  var j;
  
  height1=40+height1;
  document.getElementById("ar1").style.margin="0px 0px 0px "+height1+"px";
  
  height1=25+height1;
  document.getElementById("ar2").style.margin="0px 0px 0px "+height1+"px";