span隐藏后再次显示，位置变了…解决思路 _JavaScript

span隐藏后再次显示，位置变了…
html：

HTML code


单月查询:<input type="radio" onclick="return sign();" name="select" />
                    &nbsp;&nbsp;&nbsp;&nbsp; 多月查询:<input type="radio" onclick="return more();" name="select" />
                    &nbsp;&nbsp;&nbsp;&nbsp; 查询日期： <span>
                        <asp:DropDownList runat="server" ID="ddlYear">
                        </asp:DropDownList>
                        &nbsp;&nbsp;
                        <asp:DropDownList runat="server" ID="ddlMonth">
                        </asp:DropDownList>
                    </span>&nbsp; <span id="endDate">――&nbsp;
                        <asp:DropDownList runat="server" ID="ddlYearEnd">
                        </asp:DropDownList>
                        &nbsp;&nbsp;
                        <asp:DropDownList runat="server" ID="ddlMonthEnd">
                        </asp:DropDownList>
                    </span>

JScript code



<script type="text/javascript" language="javascript">
        function sign() {
            var newSpan = document.getElementById("endDate");
            newSpan.style.display = "none";
        }
        function more() {
            var newSpan = document.getElementById("endDate");
            newSpan.style.display = "block";
        }
    </script>

初始效果是在一行，点击多月查询时结束年月另起了一行…这是为什么？查看源文件没发现什么区别…

------解决方案--------------------
newSpan.style.display = "block";
block就是显示并独占一行的，如果要显示并不独点一行，可以指定float，
或者有预留空间的话，用visibility:visible /hidden 显示隐藏
------解决方案--------------------
newSpan.style.display = "inline";
不要block