点击按钮后怎么将焦点定位显示到相应项，有滚动条

<fieldset style="width:95%;height:100%;">
                    <legend>选择</legend>
                    <input name="tb_name" type="text" id="tb_name" style="width:80px;" /><input type="submit" name="query" value="查找" id="query" />
                    <div style="OVERFLOW-Y:scroll; WIDTH:90%; HEIGHT:180px;">
                        <table id="cbl_area" border="0" style="font-size:Small;">
    <tr>
        <td><input id="cbl_area_0" type="checkbox" name="cbl_area$0" /><label for="cbl_area_0">越城</label></td>
    </tr><tr>
        <td><input id="cbl_area_1" type="checkbox" name="cbl_area$1" /><label for="cbl_area_1">绍兴县</label></td>
    </tr><tr>
        <td><input id="cbl_area_2" type="checkbox" name="cbl_area$2" /><label for="cbl_area_2">上虞</label></td>
    </tr><tr>
        <td><input id="cbl_area_3" type="checkbox" name="cbl_area$3" /><label for="cbl_area_3">嵊州</label></td>
    </tr><tr>
        <td><input id="cbl_area_4" type="checkbox" name="cbl_area$4" /><label for="cbl_area_4">新昌</label></td>
    </tr><tr>
        <td><input id="cbl_area_5" type="checkbox" name="cbl_area$5" /><label for="cbl_area_5">诸暨</label></td>
    </tr><tr>
        <td><input id="cbl_area_6" type="checkbox" name="cbl_area$6" /><label for="cbl_area_6">a</label></td>
    </tr><tr>
        <td><input id="cbl_area_7" type="checkbox" name="cbl_area$7" /><label for="cbl_area_7">b</label></td>
    </tr><tr>
        <td><input id="cbl_area_8" type="checkbox" name="cbl_area$8" /><label for="cbl_area_8">d</label></td>
    </tr><tr>
        <td><input id="cbl_area_9" type="checkbox" name="cbl_area$9" /><label for="cbl_area_9">c</label></td>
    </tr><tr>
        <td><input id="cbl_area_10" type="checkbox" name="cbl_area$10" /><label for="cbl_area_10">d</label></td>
    </tr><tr>
        <td><input id="cbl_area_11" type="checkbox" name="cbl_area$11" /><label for="cbl_area_11">e</label></td>
    </tr><tr>
        <td><input id="cbl_area_12" type="checkbox" name="cbl_area$12" /><label for="cbl_area_12">f</label>
</td>