function ntabs(thisobj, num) {
	if(thisobj.classname == "active") return;
	var tabobj = thisobj.parentnode.id;
	var tablist = document.getelementbyid(tabobj).getelementsbytagname("li");
	for(i = 0; i < tablist.length; i++) {
		if(i == num) {
			thisobj.classname = "active";
			document.getelementbyid(tabobj + "_content" + i).style.display = "block";
		} else {
			tablist[i].classname = "normal";
			document.getelementbyid(tabobj + "_content" + i).style.display = "none";
		}
	}
}