function setBackgroundImage(){
  
  if(images.length > 0){
    if(images.length > 1){
      var imagenumb  = images.length-1;
      var randomnumb = Math.random();
      var rand1      = Math.round( (imagenumb-1) * randomnumb) + 1;
      var randimg    = images[rand1];
           
      document.body.style.backgroundImage = "url("+randimg+")";
    }else{
      document.body.style.backgroundImage = "url("+images[1]+")";
    }
  }
}

/*

if(images.length > 0){
    if(images.length > 1){
      var imagenumb  = images.length-1;
      var randomnumb = Math.random();
      var rand1      = Math.round( (imagenumb-1) * randomnumb) + 1;
      var randimg    = images[rand1];
           
      document.getElementById("bodyContainer").style.backgroundImage = "url("+randimg+")";
    }else{
      document.getElementById("bodyContainer").style.backgroundImage = "url("+images[1]+")";
    }
  }
}

*/