function moveStage(targetURL)
{	
	//var body = document.childNodes[0].childNodes[1];
	var body = document.getElementById("body");

	var css_bg = "url(/assets/images/" + targetURL + ")";	
	
	if (css_bg != body.style.backgroundImage)
	{
		body.style.backgroundImage = css_bg;
	}
	
}