function chInp(obj, chs) {
      if (chs && obj.type.toLowerCase() == "text" && obj.value == "password :") {
            var nf = obj.cloneNode(true);
            nf.type = "password";
            nf.value = "";
            obj.parentNode.replaceChild(nf, obj);
			document.login.elements[1].focus();
			document.login.elements[1].select();
      } else if (!chs && obj.value == "username :") obj.value = "";
}