Set variable JSTL within JavaScript [duplicate]

Possible Duplicate:
How to set the JSTL variable value in javascript?

I have certain codes as following:

    <c:set var="test" scope="page" value="0"/>
    <script type="text/javascript">
    var time;

    function Check(){
       if(time <= 0)
       {
           <c:set var="test" scope="page" value="1"/>         
       }
      time-=1;
    }
    </script>   

when I did

      <c:out value="${test}"/> 

it seems that its value's always 1 and it happened before time=0 or less than 0. And also did something below:

      <c:if test="${test=='1'}">
        <sql:transaction dataSource="${dataBase}">
          <sql:update var="tDel">
               DELETE FROM tmp_time WHERE username='${username}'
          </sql:update>
        </sql:transaction>
     </c:if>

It always comes to DELETE at the first time and not wait till time=0 or less. Can anyone help me out?