function rangFunc()
{	
var bg1='images/bg/home_bg1.jpg';
var bg2='images/bg/home_bg2.jpg';
var bg3='images/bg/home_bg3.jpg';
var bg4='images/bg/home_bg4.jpg';
var bg5='images/bg/home_bg5.jpg';
  var rangPics=[bg1,bg2,bg3,bg4,bg5]; // Add all the picture variables in this array.
  rangRandom=Math.floor(Math.random()*rangPics.length);
  document.getElementById('bgimg').innerHTML='<img src="'+rangPics[rangRandom]+'">';
}