Everything is pretty much out of the box. I haven't edited anything in your plugin. I did work through some bugs with you previously but I ended up downloading the plugin from WordPress again anyway once you'd updated the release version.
The shortcode I am using is pretty straightforward.
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[spoiler intro="A Grade"][pageview url="
http://www.darwin.netball.asn.au/ladder_print.asp?comp=35833&OrgID=229" height="700px"][/spoiler]
[spoiler intro="A Reserve"][pageview url="
http://www.darwin.netball.asn.au/ladder_print.asp?comp=35854&OrgID=229" height="950px"][/spoiler]
[spoiler intro="Division 1"][pageview url="
http://www.darwin.netball.asn.au/ladder_print.asp?comp=35855&OrgID=229" height="950px"][/spoiler]
[spoiler intro="Division 2"][pageview url="
http://www.darwin.netball.asn.au/ladder_print.asp?comp=35856&OrgID=229" height="950px"][/spoiler]
[spoiler intro="Division 3"][pageview url="
http://www.darwin.netball.asn.au/ladder_print.asp?comp=35857&OrgID=229" height="800px"][/spoiler]
[/spoilergroup]