{groovy}
String html = new URL("http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDT13400.html").openStream().text

String start = "<!--IDT13400-->"
int i = html.indexOf(start)
if (i>0)
  html = html.substring(i+start.length())

String end = "<!--************* START OF STANDARD BUREAU FOOTER"
i = html.indexOf(end)
if (i>0)
  html = html.substring(0, i)

println html
{groovy}