function randomImage(targetImage)
{
	var img = document.getElementById(targetImage);
	var path = img.src;
	var pArr = path.split('/');

	var file = pArr.pop();
	path = pArr.join('/');	
	
	var newImg = Math.floor(Math.random()*20)+1;	
	img.src = path+"/"+newImg+".jpg";
	
}