The first is:
<script language="javascript" type="text/javascript">
window.location.href = "login.jsp? backurl =" + window.location.href;
</ script>

The second:
<script language="javascript">
alert ( "return");
window.history.back (-1);
</ script>

Third:
<script language="javascript">
window.navigate ( "top.jsp");
</ script>

The fourth:
<script language="JavaScript">
self.location = 'top.htm';
</ script>

Fifth:
<script language="javascript">
alert ( "unauthorized access!");
top.location = 'xx.jsp';
</ script>