how to call alert box using jsp -

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i facing problem while calling alert box. can know procedure call box in jsp?

my function is

<script type="text/javascript" src="js/ufo.js"></script> <script  type="text/javascript">     function foon() {         alert("sorry! not valid user!! click here go login!!!");         history.back(1);     } </script>

now how call foon() function inside if statement?

probably want like:

<c:if test="something"><script type="text/javascript">foon()</script></c:if>

alternately embed alert right there, depends on need reuse.


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