Enable Scrollbar on Popup

I have this is my popup, and would like to enable a scrollbar...how can I edit the following and where exactly to put the scrollbar:

onclick="javascript:window.open('alanbio.asp', 'prop', 'height=500,width=500', false)
Joshua DumasAsked:
Who is Participating?
ZvonkoSystems architectCommented:
Like this:

    onclick="window.open('alanbio.asp', 'prop', 'height=500,width=500,scrollbars=yes')"

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