母版页中使用日历控件的问题

Question

在单独的页面中可以用，放在母版页中就用不了。听说要改控件的ID，怎么改，在哪改。我用的那个日历控件比较简单，比如：
<asp:TextBox ID="TextBox7" runat="server" Enabled="False" Width="100px" ReadOnly="True" CssClass="edLine"></asp:TextBox>
              
                  <img alt="*" id="Image_blqx1" style="CURSOR: hand" onclick="popUpCalendar(this,document.forms[0].TextBox7,'yyyy-mm-dd')"
                                 src="images/calendar.gif" />

Answer 1

document.forms[0].TextBox7
改为
document.getElementById("<%=TextBox7.ClientID %>")

Answer 2

<asp:TextBox   ID= "TextBox7 "   runat= "server "   Enabled= "False "   Width= "100px "   ReadOnly= "True "   CssClass= "edLine "> </asp:TextBox> 
                            
                                    <img   alt= "* "   id= "Image_blqx1 "   style= "CURSOR:   hand "   onclick= "popUpCalendar(this,document.all.<%=txtBirthday.ClientID %>, 'yyyy-mm-dd ') " 
                                                                  src= "images/calendar.gif "   />