how to change the title of message box / alert box.

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ASP.NET

Javascript

Hi experts,

I have created a web based project in asp.net , C#

here am facing problem with popup message.

on my webpage i have registration form to enter user details. i gave validations here.
everything is working perfectly.

Suppose if i click submit button without filling the fields.

it shows a pop up message "The Page at localhost:641235 says : "

I want to set this title of my own.

Note: I used validation controls here, not javascript for validations.

My requirement is just i want to change the Title of alert message..,thats it.

Please help thank you......................