How to find out the browser is minimized in javascript

Hi I have a notification div(divNotify)

with some information and a timer on the homepage

   Protected Sub Timer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
       Try
           Me.GetNotification_Stats()

           ScriptManager.RegisterClientScriptBlock(Me.Page, GetType(String), "Alert", "Show_NotifyDiv();", True)

       Catch ex As Exception
           Me.lblError.Visible = True
           Me.lblError.InnerText = ex.Message
       End Try
   End Sub

      

        
        
        
      

    

divNotify

will be displayed for a certain period of time.
here i need when the user minimizes the browser he will be notified by the blinking browser and the browser color change.

but first of all how to know if browser is minified or not in javasript here i am using jquery for show div tag

  function Show_NotifyDiv() {              
            $("#div_NotificationOuter").show(1000);
            $("#div_NotificationOuter").animate({ bottom: '+=30px' }, 4000);
    }