JavaScript confirm

I have a DataList which displays the first & last name of users as links (LinkButtons). When the links are clicked, 2 textboxes appear - one with the first name & the other with the last name - for the users to edit. At the same time, 3 LinkButtons - Cancel, Update & Delete also appear. I want to add a JavaScript confirm dialog to the Delete LinkButton. This is how I tried it in the OnItemDataBound event function of the DataList:

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<script runat="server">
    Sub BindItem(...........)
        If (dlUsers.EditItemIndex <> -1) Then
            If (ea.Item.ItemType = ListItemType.AlternatingItem Or ea.Item.ItemType = ListItemType.Item) Then
                Dim lnkDel As LinkButton
    & ...