send notifications in asp.net

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ASP.NET

Javascript

i try to send notifications in asp.net

when admin login and click on add message then this message send to user when user log in then pop up notications appear

here i try

<input class="add_message" type="text" value="type your message" name="add_message">
</input>
 <input type="button" value="add message" 
    önclick="sNotify.addToQueue($(".add_message").attr("value"))"></input>

   <script type='text/javascript'>
   sNotify.addToQueue("You can add your message here."); 

   sNotify.timeOpen = 10;

this code in try in approval.aspx

and this is the link where i get concept ..plz see this link i implement and add javascript in js folder and try to code it but when i click on add message then pop can not appear...?? how i do this?
http://www.gayadesign.com/diy/snotify-easy-notifications-in-jquery/

any help?