Edit pop up in Navigate away in Java script

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Javascript

i m using onbeforeunload function to get the pop up before navigate away from the
current page pop up will show below message,

------------------------------------------------------
Are you sure want to navigate away from this page !
!
< my customize Message >

Press OK to continue OR Cancel to stay on the page

-------------------------------------------------------


these three lines are coming middle one is my customise line

now i want to show only my customize message what to do?

i searched on net but didn't got any answer.

OR

when i not passing my customize message there is a more space in line 1 and line 3
if i want to remove that space what should be done.





thank you in advance its urgent...



here is my code
-----------------------------

function OnClosWindow() {
        if (window.confirm('Are you sure you want to navigate away from this page?\n\nYou have not submitted any narrowings for the candidates.\n\nPress OK to continue, or Cancel to stay on the current page.')) {
            reload = true;
            return true;
        }
        else {
            return false;
        }
    }
    var reload = false;
    function resetreload() {
        reload = true;
    }
    function isNavigating() {
        //alert(reload);
        if (!reload) {
            reload = false;
            return "You sures";
        }

    }
    window.onbeforeunload = isNavigating;
--------------------------------------------------------


<a href="http://www.google.com">Navigate HyperLink</a><br />
<asp:Button ID="Button2" runat="server" Text="No Navigate Away" OnClientClick="return resetreload();" />
<asp:Button ID="Button1" runat="server" Text="Navigate Away" OnClientClick="return OnClosWindow();" />



please help need solution