Not able to run javascript in content page while using Masterpage
<p><strong>I am not able to run progressbar code in asp.net on button click,while using contentpage/masterpage.<br>
I have checked code without masterpage it'sworking cool..but getting problem while using
masterpage.
What is the problem i am not able to figure out??</strong></p>

<pre><code> &lt;%@ Page Title="" Language="C#" MasterPageFile="~/Admin.master" AutoEventWireup="true" CodeFile="UploadStudentDB.aspx.cs" Inherits="Admin_UploadStudentDB" %&gt;

        &lt;asp:Content ID="Content1" ContentPlaceHolderID="Contentplaceholder2" Runat="Server"&gt;
          &lt;script language="javascript" type="text/javascript"&gt;
            var size = 2;
            var id = 0;

            function ProgressBar() {
                if (document.getElementById('&lt;%=txtFilePath.ClientID %&gt;').value != "") 
                {
                    document.getElementById("divProgress").style.display = "block";
                    document.getElementById("divUpload").style.display = "block";
                    id = setInterval("progress()", 20);
                    return true;
                }
                else {
                    alert("Select a file to upload");
                    return false;
                }
            }

            function progress() {
                size = size + 1;
                if (size &gt; 299) {
                    clearTimeout(id);
                }
                document.getElementById("divProgress").style.width = size + "pt";
                document.getElementById("&lt;%=lblPercentage.ClientID %&gt;").
                        firstChild.data = parseInt(size / 3) + "%";
            }

        &lt;/script&gt;
        &lt;body&gt;
            &lt;div id="divUpload" style="display:none"&gt;
                                 &lt;div style="width:300pt;text-align:center;"&gt;Uploading...&lt;/div&gt;
                                  &lt;div style="width:300pt;height:20px; border:solid 1pt gray"&gt;
                                  &lt;div id="divProgress" runat="server" 
                     style="width: 1pt; height: 20px; background-color:Gray;display:none"&gt;
                                   &lt;/div&gt;
                                     &lt;/div&gt;
                      &lt;div style="width:300pt;text-align:center;"&gt;
                         &lt;asp:Label ID="lblPercentage" runat="server" 
                         Text="Label"&gt;&lt;/asp:Label&gt;&lt;/div&gt;
                                 &lt;/div&gt;

         &lt;div align="center"&gt;
            &lt;table style="width: 100%; background-color:Silver"  border="1"&gt;
                        &lt;tbody align="center"&gt;
                        &lt;tr&gt;
                            &lt;td align="center"&gt;
                            &lt;asp:Label ID="Label2" runat="server" Font-Bold="True" Font-Size="XX-Large" 
                Text="Please Select Excel File Containg Student Details..." ForeColor="White" 
                Font-Underline="True"&gt;&lt;/asp:Label&gt;


                            &lt;/td&gt;
                        &lt;/tr&gt;
                            &lt;tr&gt;
                                &lt;td&gt;
                         &lt;div style="background: url(hline.gif) repeat-x bottom #F2F2F2;padding: 8px 5px;border-bottom: 1px solid #ccc;"&gt;
                                    &lt;asp:FileUpload ID="txtFilePath" runat="server"&gt;&lt;/asp:FileUpload&gt;&amp;nbsp;&amp;nbsp;
                                    &lt;asp:Button 
                                        ID="btnUpload" runat="server" Text="Upload" OnClientClick="return ProgressBar();" onclick="btnUpload_Click"  /&gt;
                                    &lt;br /&gt;
                                    &lt;asp:Label ID="lblMessage" runat="server" Visible="False" Font-Bold="True" 
                                        ForeColor="#009933" Font-Size="Large"&gt;&lt;/asp:Label&gt;
                                &lt;/div&gt;



                                &lt;/td&gt;
                            &lt;/tr&gt;
    &lt;table&gt;
    &lt;/div&gt;
</code></pre>

<p></p>
