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If you were doing a full page postback, a crude way of achieving it would be to assign the script or function to a instead? However, you can Java Script on the server side, but it will need to be output to the page before it can run. Get Type(), "alertscript", script, True) End If End If Mistakes in the previous post: If Data Store. Exists(the Record) Then Dim script As String = "alert(' Record exists');" If Not Page. The most comprehensive way of doing it would be to use AJAX - either . j Query's AJAX (and AJAX in general) is a separate topic, which you can read about here.