var currentTabContent;

var btnLogIn_n = new Image();
btnLogIn_n.src = "/images/utility/btn_log_in_n.gif";
var btnLogIn_a = new Image();
btnLogIn_a.src = "/images/utility/btn_log_in_a.gif";

var btnLogOffYes_n = new Image();
btnLogOffYes_n.src = "/images/utility/btn_log_out_yes_n.gif";
var btnLogOffYes_a = new Image();
btnLogOffYes_a.src = "/images/utility/btn_log_out_yes_a.gif";

var btnLogOffNo_n = new Image();
btnLogOffNo_n.src = "/images/utility/btn_log_out_no_n.gif";
var btnLogOffNo_a = new Image();
btnLogOffNo_a.src = "/images/utility/btn_log_out_no_a.gif";

function validateLogIn() {
	if (document.frmLogin.username.value == "") {
		alert('Please enter your Username.');
		changeClass(document.frmLogin.username, 'error');
		document.frmLogin.username.focus();
		return false;
	} else if (document.frmLogin.password.value == "") {
		alert('Please enter your Password.');
		changeClass(document.frmLogin.password, 'error');
		document.frmLogin.password.focus();
		return false;
	}
	document.frmLogin.submit();
	return false;
}

function clearTab() {
	document.getElementById(currentTabContent).style.visibility = "hidden";
	currentTabContent = "";
}

function setTab(obj, id) {
	obj.blur();
	if (currentTabContent)
		document.getElementById(currentTabContent).style.visibility = "hidden";
	if (id) {
		currentTabContent = id;
		document.getElementById(id).style.visibility = "visible";
	}
}