function tabit(btn) {
    var oD = btn.parentNode.getElementsByTagName("li");
    for (i = 0; i < oD.length; i++) {
		document.getElementById(oD[i].id + "Sel").style.display = "none";
		oD[i].className=oD[i].className.replace(new RegExp("( ?|^)sel\\b"), "");
    }
    document.getElementById(btn.id + "Sel").style.display = "block";
    btn.className += (btn.className.length > 0 ? " " : "") + "sel";
}