How to get value in showModalDialog()

Hi,
I would like to know how to get value pass into showModalDialog() to be used by the server (using request.getParameter())
TQ

please try out this kind of code
<script language="javascript">
     function trial(){
          var retVal = new Object();
          retVal = ShowModalDialog("ur JSp");
</script>
<script>
<form >
<input type="hidden" name ="mylink "value= javascript:trial();>
</form>
<%
     String str=request.getParameter("mylink");
%>
and plz let me know .. if it works

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