// swap backgrounds of specie
var images = new Array('elephant.gif','bird.gif','rhino.gif','shark.gif','turtle.gif')


var image = document.getElementById('specie')
if (image) {
	var index = Math.floor(Math.random() * (images.length+1))  // set to length+1 if you want a chance of current bg staying
	if (index < images.length) {
		image.style.backgroundImage = 'url()'
		image.style.backgroundImage = 'url(../images/'+images[index]+')'
	}
}