Simple high-level wrapper for Sarissa

In some cases, Sarissa calls are too low-level for my needs. For example, sometimes I need a function that would load an XML document synchronously and just throw an error if something fails. Here it is:

function loadURI(uri,async) {
  var d = Sarissa.getDomDocument();
  d.async = false;
  d.load(uri);
  if (d.parseError) throw("Error loading "+uri+": "+Sarissa.getParseErrorText(d));
  return d;
}