adding scrollbars to this particular popup script

How/where can I add scrollbars=1? I've tried a couple places, neither of which worked.

function openpopup()
{
var popurl="popup.html"

zWinWide=500;
zWinHigh=600;

zAttrib='resizable';

zScrWide=screen.width;
zScrHigh=screen.height;

zLeftPos=(zScrWide/2)-(zWinWide/2);
zTopPos=(zScrHigh/2)-(zWinHigh/2);

winpops=window.open(popurl, '', 'width=' + zWinWide + ',height=' + zWinHigh + ',left=' + zLeftPos + ',top=' + zTopPos + ','+zAttrib,+scrollbars=yes);
}

Hello Ashley Quick -

Change this variable definition:
zAttrib='resizable';
to:
zAttrib='resizable,scrollbars=yes';

- Rex

Like a charm, thanks!