function Next(student){
	var parts = document.images.thisPic.src.split("/");
	var PicDir = parts[parts.length-2];
	var nextName = parts[parts.length-1].substr(0,1)*1+1;
	if (nextName > 3) nextName = 1;
	document.images.thisPic.src = "img/"+student+"/"+nextName+".jpg";
}