关于js调用的问题

JScript code

function trying(){    if(check()){                alert("test1");        s1();                alert("test3");    }     function s1(){              alert("test2");        }}

HTML code

    <script type="text/javascript" language="javascript">        function trying(){            if(check()){                alert("test1");                s1();                alert("test3");            }            function s1(){                alert("test2");            }        }        function check(){            return 1;        }        trying()    </script>