一个关于日期的问题，恳请高手赐教！！！

Question

以前我写的代码是实现一个时间段的查询，若要实现查询某一天的功能只能在两个日期选择框都选择那个日期，现在想实现在这两个日期选择框中任意在一个框中填入某个日期，都能显示那一天的，而不是显示大于等于或者小于等于某个日期的所有数据。 查询日期从:
<INPUT class="text" type="text"
name="search_adddate@start__cp_ge_tp_String" size="10">
<img id="calBegin" src="/psm/components/calendar/skins/aqua/cal.gif"
border="0" alt="选取起始日期" style="cursor:pointer">
<script type="text/javascript">
                       new calendar("search_adddate@start__cp_ge_tp_String", "calBegin", "%Y%m%d");
                    </script>
    到
<input class="text" type="text"
name="search_adddate@end__cp_le_tp_String" size="10">
<img id="calEnd" src="/psm/components/calendar/skins/aqua/cal.gif"
border="0" alt="选取结束日期" style="cursor:pointer">
<script type="text/javascript">
                       new calendar("search_adddate@end__cp_le_tp_String", "calEnd", "%Y%m%d");
                       </script>
                                              <%@include file="/common/queryButton.jsp"%>加入判断条件后代码为：
 查询日期从(若查询某一天的情况，则在两个日期中都选择那天):
<INPUT class="text" type="text"
name="search_adddate@start__cp_ge_tp_String" size="10">
<img id="calBegin" src="/psm/components/calendar/skins/aqua/cal.gif"
border="0" alt="选取起始日期" style="cursor:pointer">
<script type="text/javascript">
                       new calendar("search_adddate@start__cp_ge_tp_String", "calBegin", "%Y%m%d");
                    </script>
    到
<input class="text" type="text"
name="search_adddate@end__cp_le_tp_String" size="10">
<img id="calEnd" src="/psm/components/calendar/skins/aqua/cal.gif"
border="0" alt="选取结束日期" style="cursor:pointer">
<script type="text/javascript">
                       new calendar("search_adddate@end__cp_le_tp_String", "calEnd", "%Y%m%d");
                       </script>
                       <input class="text" type="hidden"
name="search_adddate" size="10">
                    <script type="text/javascript">
                    var startdate=document.getElementById("search_adddate@start__cp_ge__tp_String").value;
                    var enddate=document.getElementById("search_adddate@end__cp_le__tp_StringPlus").value;
                    var onedate=document.getElementById("search_adddate");
                       if(startdate!=" "&&enddate==" "){
                       onedate.value=startdate;
                      enddate=" ";
                       }
                       if(startdate==" "&&enddate!=" "){
                       onedate.value=enddate;
                       startdate=" ";
                       }
                    </script> 
                       <%@include file="/common/queryButton.jsp"%>但是我现在运行新的代码完全没有效果，恳请高手指点！~