Javascript function is not getting call from code behind when it is put on master page

Question

I have 2 pages named as :Abc.aspx and popupAbc.aspx

Now on Abc.aspx i have below button on click of which i am opening popupAbc.aspx as pop up:

<asp:Button ID="btnOpenChildAbcPopup" runat="server" Text="Open" UseSubmitBehavior="false" CausesValidation="False" OnClick="btnOpenChildAbcPopup_Click" />

Code Behind:

protected void btnOpenChildAbcPopup_Click(object sender, EventArgs e)
        {
            string url="../popupAbc.aspx";
            ScriptManager.RegisterStartupScript(Page, GetType(), "alert", "OpenChildAbcPopup('" + url + "');",
                    true);
        }

function OpenChildAbcPopup(url) {
                    $.fancybox({
                        'onStart ': function () { $.fancybox.hideActivit() },
                        'onComplete': function () { $.fancybox.hideActivity() },
                        'titleShow': 'true',
                        'titlePosition': 'over',
                        'titleFormat': 'formatTitle',
                        'href': url,//popupAbc.aspx
                        'type': 'iframe',
                        'width': '1000',
                        'height': '500',
                        'fitToView': false,
                        'autoSize': false,
                        'hideOnOverlayClick': false,
                        'hideOnContentClick': false,
                        'overlayOpacity': 0.7,
                        'enableEscapeButton': false,
                        'closeEffect': 'none' 
                    });
                    $.fancybox.hideLoading();
                    return false;
                }

Here up till now everythings works perfectly and on click of button my popupAbc.aspx opens perfectly in pop up box but problem is with in this popupAbc.aspx.

i have one button in popupAbc.aspx in which i will save some data and after saving data i would like to again call the javascript function which is on master page but that javascript function is not calling.

This is my page:popupAbc.aspx

  <%@ Page Language="C#" AutoEventWireup="true" MasterPageFile="~/MyMaster.Master" CodeBehind="popupAbc.aspx.cs" Inherits="popupAbc.aspx" %>

<asp:Button ID="btnSubmit" runat="server" Text="Save" OnClick="btnSubmit_Click" UseSubmitBehavior="true"  ValidationGroup="p1" />

 protected void btnSubmit_Click(object sender, EventArgs e)
        {
            //code for saving form data in database and after that call javascript function which
            //is on MyMaster page
            ScriptManager.RegisterStartupScript(Page, GetType(), "Js", "ExitMyCurrentFancyBox();", true);
        }

But in firebug console it is throwing error that ExitMyCurrentFancyBox is not defined.

When i put this ExitMyCurrentFancyBox function in my popupAbc.aspx then it is calling successfully but when i put this on my master page then it is not calling.

function ExitMyCurrentFancyBox() {
                alert()
            }

Note:My Abc.aspx uses update panel and popupAbc.aspx doesnt uses update panel.

Can anybody tell me why that Javascript function is not calling when i put it on master page and how to call it when it is on master page??

I have tried all this but still any of below is not working:

 // ScriptManager.RegisterStartupScript(Page, GetType(), "alert", "ExitMyCurrentFancyBox();", true);
               // ScriptManager.RegisterStartupScript(Page, GetType(), "alert", "ExitMyCurrentFancyBox();", true);
                //ClientScript.RegisterClientScriptBlock(GetType(), "sas", "CloseFancyboxtl();", true);
              //  ScriptManager.RegisterStartupScript(this, this.GetType(), "ntmtch", "ExitMyCurrentFancyBox();", true);
          //  ScriptManager.RegisterStartupScript(Page, Page.GetType(), "msg", "ExitMyCurrentFancyBox();", true);
            //ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "ExitMyCurrentFancyBox;", true);
            ScriptManager.RegisterClientScriptBlock(this.Page, GetType(), Guid.NewGuid().ToString(), "ExitMyCurrentFancyBox();", true);

Answer 1

Posting possible solution due to your request.

Add next method to your MasterPage:

public void ShowMyJavascript(){
    Response.Write("<script language='javascript'>alert('Here is my message to be displayed as an alert');</script>");
}

And in your content page:

this.Master.ShowMyJavascript();