function flip_userbox(id) {
	var b1=document.getElementById("foreground_"+id);
	var b2=document.getElementById("background_"+id);
	if(b2.style.display!="block") {
		b1.style.display="none";
		b2.style.display="block";
	} else {
		b1.style.display="block";
		b2.style.display="none";
	}
}