체크박스 스크립트 질문

<aside id="side_search" class="at-sidebar en<?php echo $sidebar_effect;?>">    <div class="close-box asideButton1" title="Hide sidebar" style="margin-top:100px;">        <i class="fa fa-search"></i>    </div>    <div class="sidebar-wrap">    <form name="frmdetailsearch" role="form"  method="get" action="/shop/search.php" onsubmit="return fsearchbox_submit(this);">    <input type="hidden" name="qsort" id="qsort" value="<?php echo $qsort ?>">    <input type="hidden" name="qorder" id="qorder" value="<?php echo $qorder ?>">    <input type="hidden" name="qcaid" id="qcaid" value="<?php echo $qcaid ?>">        <div>            <div id="group1">                <label style="display:block;"><b>고객님꼐서 가장 중요하게 생각하시는 기능은?</b><br></label>                    <input type="checkbox" id="step1_1" onclick="eventCheck(this,'group1')"> 스크린 프로젝터<br>                    <input type="checkbox" id="step1_2" onclick="eventCheck(this,'group1')"> 판서(글쓰기)<br>                    <input type="checkbox" id="step1_3" onclick="eventCheck(this,'group1')"> 지움성<br>                    <input type="checkbox" id="step1_4" onclick="eventCheck(this,'group1')"> 인테리어 효과            </div>            <div id="group2_1" style="display:none;">                <label style="display:block;"><b>스크린 프로젝터</b><br></label>                    <input type="checkbox" id="step2_1" name="it_1[]" value="1" onclick="eventCheck(this,'group2_1')" <?php echo in_array("1",$it_1)?'checked="checked"':'';?>> 무반사 화이트보드<br>                    <input type="checkbox" id="step2_2" name="it_1[]" value="2" onclick="eventCheck(this,'group2_1')" <?php echo in_array("2",$it_1)?'checked="checked"':'';?>> 무반사 화이트보드 시트지<br>                    <input type="checkbox" id="step2_3" name="it_1[]" value="3" onclick="eventCheck(this,'group2_1')" <?php echo in_array("3",$it_1)?'checked="checked"':'';?>> 스크린 유리보드<br>                    <input type="checkbox" id="step2_4" name="it_1[]" value="4" onclick="eventCheck(this,'group2_1')" <?php echo in_array("4",$it_1)?'checked="checked"':'';?>> 그랜드뷰 리마커블 스크린            </div>            <div id="group2_2" style="display:none;">                <label style="display:block;"><b>판서(글쓰기)</b><br></label>                    <input type="checkbox" id="step2_5" name="it_1[]" value="1" onclick="eventCheck(this,'group2_2')" <?php echo in_array("1",$it_1)?'checked="checked"':'';?>> 두배로 화이트보드<br>                    <input type="checkbox" id="step2_6" name="it_1[]" value="2" onclick="eventCheck(this,'group2_2')" <?php echo in_array("2",$it_1)?'checked="checked"':'';?>> 두배로 화이트보드 시트지<br>                    <input type="checkbox" id="step2_7" name="it_1[]" value="3" onclick="eventCheck(this,'group2_2')" <?php echo in_array("3",$it_1)?'checked="checked"':'';?>> 난반사 유리보드<br>                    <input type="checkbox" id="step2_8" name="it_1[]" value="4" onclick="eventCheck(this,'group2_2')" <?php echo in_array("4",$it_1)?'checked="checked"':'';?>> 유광 유리보드<br>                    <input type="checkbox" id="step2_9" name="it_1[]" value="3" onclick="eventCheck(this,'group2_2')" <?php echo in_array("3",$it_1)?'checked="checked"':'';?>> 법랑화이트보드<br>                    <input type="checkbox" id="step2_10" name="it_1[]" value="3" onclick="eventCheck(this,'group2_2')" <?php echo in_array("3",$it_1)?'checked="checked"':'';?>> 물칠판<br>                    <input type="checkbox" id="step2_11" name="it_1[]" value="3" onclick="eventCheck(this,'group2_2')" <?php echo in_array("3",$it_1)?'checked="checked"':'';?>> 청칠판            </div>            <div id="group2_3" style="display:none;">                <label style="display:block;"><b>지움성</b><br></label>                    <input type="checkbox" id="step2_5" name="it_1[]" value="1" onclick="eventCheck(this,'group2_3')" <?php echo in_array("1",$it_1)?'checked="checked"':'';?>> 두배로 화이트보드<br>                    <input type="checkbox" id="step2_6" name="it_1[]" value="2" onclick="eventCheck(this,'group2_3')" <?php echo in_array("2",$it_1)?'checked="checked"':'';?>> 두배로 화이트보드 시트지<br>                    <input type="checkbox" id="step2_7" name="it_1[]" value="3" onclick="eventCheck(this,'group2_3')" <?php echo in_array("3",$it_1)?'checked="checked"':'';?>> 난반사 유리보드<br>                    <input type="checkbox" id="step2_8" name="it_1[]" value="4" onclick="eventCheck(this,'group2_3')" <?php echo in_array("4",$it_1)?'checked="checked"':'';?>> 유광 유리보드            </div>            <div id="group2_4" style="display:none;">                <label style="display:block;"><b>인테리어 효과</b><br></label>                    <input type="checkbox" id="step2_1" name="it_1[]" value="1" onclick="eventCheck(this,'group2_4')" <?php echo in_array("1",$it_1)?'checked="checked"':'';?>> 무반사 화이트보드<br>                    <input type="checkbox" id="step2_2" name="it_1[]" value="2" onclick="eventCheck(this,'group2_4')" <?php echo in_array("2",$it_1)?'checked="checked"':'';?>> 무반사 화이트보드 시트지<br>                    <input type="checkbox" id="step2_7" name="it_1[]" value="3" onclick="eventCheck(this,'group2_4')" <?php echo in_array("3",$it_1)?'checked="checked"':'';?>> 난반사 유리보드<br>                    <input type="checkbox" id="step2_4" name="it_1[]" value="4" onclick="eventCheck(this,'group2_4')" <?php echo in_array("4",$it_1)?'checked="checked"':'';?>> 그랜드뷰 리마커블 스크린            </div>            <div id="group3_1" style="display:none;">                <div>                    <label style="display:block;"><b>선택 옵션</b><br></label>                        <input type="checkbox" name="it_2" value="yes" <?php echo $it_2_check?'checked="checked"':'';?>> 자석 기능<br>                        <input type="checkbox" name="it_3" value="yes" <?php echo $it_3_check?'checked="checked"':'';?>> 이동식 스탠드<br>                        <input type="checkbox" name="it_4" value="yes" <?php echo $it_4_check?'checked="checked"':'';?>> 맞춤시공                </div>                <div>                    <label style="display:block;"><b>프레임 스타일</b><br></label>                        <input type="checkbox" name="it_5" value="" <?=$_GET['it_5']==''?' checked="checked"':''?>> 전체<br>                        <input type="checkbox" name="it_5[]" value="1" <?php echo in_array("1",$it_5)?'checked="checked"':'';?>> 알루미늄(은색)<br>                        <input type="checkbox" name="it_5[]" value="2" <?php echo in_array("2",$it_5)?'checked="checked"':'';?>> 오크목<br>                        <input type="checkbox" name="it_5[]" value="3" <?php echo in_array("3",$it_5)?'checked="checked"':'';?>> 월넛목<br>                        <input type="checkbox" name="it_5[]" value="4" <?php echo in_array("4",$it_5)?'checked="checked"':'';?>> 화이트목<br>                        <input type="checkbox" name="it_5[]" value="5" <?php echo in_array("5",$it_5)?'checked="checked"':'';?>> 블랙목                </div>                <div class="nop">                    <label><b>가로 선택 (cm)</b></label>                    <div>                        <label>                            <input type="text" name="wfrom" value="<?php echo $wfrom; ?>" id="ssch_wfrom" size="10" placeholder="최소 가로">                        </label>                        <label> ~</label>                        <label>                            <input type="text" name="wto" value="<?php echo $wto; ?>" id="ssch_wto" size="10" placeholder="최대 가로">                        </label>                    </div>                </div>                <div class="nop">                    <label><b>세로 선택 (cm)</b></label>                    <div>                        <label>                            <input type="text" name="hfrom" value="<?php echo $hfrom; ?>" id="ssch_hfrom" size="10" placeholder="최소 세로">                        </label>                        <label> ~</label>                        <label>                            <input type="text" name="hto" value="<?php echo $hto; ?>" id="ssch_hto" size="10" placeholder="최대 세로">                        </label>                    </div>                </div>                <div class="nop">                    <label><b>상품가격 (원)</b></label>                    <div>                        <label>                            <input type="text" name="qfrom" value="<?php echo $qfrom; ?>" id="ssch_qfrom" size="10" placeholder="최소 가격">                        </label>                        <label> ~</label>                        <label>                            <input type="text" name="qto" value="<?php echo $qto; ?>" id="ssch_qto" size="10" placeholder="최대 가격">                        </label>                    </div>                </div>                <div class="si">                    <div>                        <button type="submit">검색하기</button>                    </div>                </div>            </div>            <div id="group3_2" style="display:none;">                <div>                    <label style="display:block;"><b>선택 옵션</b><br></label>                        <input type="checkbox" name="it_4" value="yes" <?php echo $it_4_check?'checked="checked"':'';?>> 맞춤시공                </div>                <div class="nop">                    <label><b>가로 선택 (cm)</b></label>                    <div>                        <label>                            <input type="text" name="wfrom" value="<?php echo $wfrom; ?>" id="ssch_wfrom" size="10" placeholder="최소 가로">                        </label>                        <label> ~</label>                        <label>                            <input type="text" name="wto" value="<?php echo $wto; ?>" id="ssch_wto" size="10" placeholder="최대 가로">                        </label>                    </div>                </div>                <div class="nop">                    <label><b>세로 선택 (cm)</b></label>                    <div>                        <label>                            <input type="text" name="hfrom" value="<?php echo $hfrom; ?>" id="ssch_hfrom" size="10" placeholder="최소 세로">                        </label>                        <label> ~</label>                        <label>                            <input type="text" name="hto" value="<?php echo $hto; ?>" id="ssch_hto" size="10" placeholder="최대 세로">                        </label>                    </div>                </div>                <div class="nop">                    <label><b>상품가격 (원)</b></label>                    <div>                        <label>                            <input type="text" name="qfrom" value="<?php echo $qfrom; ?>" id="ssch_qfrom" size="10" placeholder="최소 가격">                        </label>                        <label> ~</label>                        <label>                            <input type="text" name="qto" value="<?php echo $qto; ?>" id="ssch_qto" size="10" placeholder="최대 가격">                        </label>                    </div>                </div>                <div class="si">                    <div>                        <button type="submit">검색하기</button>                    </div>                </div>            </div>            <div id="group3_3" style="display:none;">                <div>                    <label style="display:block;"><b>선택 옵션</b><br></label>                        <input type="checkbox" name="it_4" value="yes" <?php echo $it_4_check?'checked="checked"':'';?>> 맞춤시공                </div>                <div class="si">                    <div>                        <button type="submit">검색하기</button>                    </div>                </div>            </div>        </div>    </form>    </div>    <script>        function set_sort(qsort) {            var f = document.frmdetailsearch;            var qorder = "desc";            if(qsort == "it_price_min") {                qsort = "it_price";                qorder = "asc";            }            f.qsort.value = qsort;            f.qorder.value = qorder;            f.submit();        }        function set_ca_id(qcaid) {            var f = document.frmdetailsearch;            f.qcaid.value = qcaid;            f.submit();        }    </script>    <script language="javascript">        $(function(){            $("div#group1").find("input[type='checkbox']").click(function(){                idx = $("div#group1").find("input[type='checkbox']").index(this);                         $("div#group1").find("input[type='checkbox']").each(function(i){                    if(idx == i && $(this).is(":checked")){                        $("#group2_" + parseInt(i+1)).show();                    }else{                        $(this).attr("checked", false);                        $("#group2_" + parseInt(i+1)).hide();                    }                })            });        });           </script></aside>