var uidDefault = "Enter user name";
var pwdDefault = "Enter password";

function validateLogin(form)
{
	var usernameField = form.username;
	var passwordField = form.password;
	
	if (usernameField && passwordField) {
		var usernameValue = usernameField.value;
		var passwordValue = passwordField.value;
		
		if ((usernameValue == "") || (usernameValue == uidDefault)) {
			if ((passwordValue == "") || pwdDefault) {
				alert("Please enter your User Name and Password.");
			} else {
				alert("Please enter your User Name.");
			}
			usernameField.focus();
			return false;
		}
		else if ((passwordValue == "") || (passwordValue == pwdDefault)) {
			alert("Please enter your Password.");
			passwordField.focus();
			return false;
		}
	}
	return true;
}

function clearField(fldObj) {
	if ((fldObj.value == uidDefault) || (fldObj.value == pwdDefault)){
		fldObj.value = "";
	}
}