Goto top of Form, then open an image image in new window

I have to put a button on the form that sends the user to the top of the form, then opens a new window with an image in it. I can send the user to the top of the form with JavaScript. But I can't seem open a new window with the image. This is the image opening code I'm using
        scriptKey = "UniqueKeyForThisScript2"         javaScript = "<script type='text/javascript'>window.open(http://localhost/Images/" + LinkButton3.ToolTip + ", _blank, );</script>"         ClientScript.RegisterStartupScript(Me.GetType(), scriptKey, javaScript)
Thanks in advance