急!请各位高手帮我看看我这段代码该如何调试?

<meta http-equiv="Content-Language" content="zh-cn">
<%response.buffer=true
response.end%>

<script Language=JavaScript>
setTimeout('this.location.reload();',30000);
function lhzy(zy) extends Thread {
    var zy;
    var gl = 0;
    Thread t;
    int i = 0;
    if (zy < 1000)
        break;
    else {
        do {
            i++;
            t.sleep(3600000);
            gl++
            zy = zy - 1000;
        } while (zy < 1000)
    }
    return gl;
}
</script>