<script language=javascript>
    function factorial( val, is_transient)
    {
            var ret =  val ==  1 ?  1 :   factorial( val-1, 1) * val;
            if ( ! is_transient) {
            document. write( "factorial of " +   val + " is: " + ret +  "<br>") ;
            } ;
    } ;
    factorial( 6, 0) ;
    factorial( 3, 0) ;
    factorial( 9, 0) ;
</script>