css3-multi-column.js: offline development

Line 83 (function loadCssCache) of the file above:

  if(typeof xmlhttp.status 'undefined' ||
     xmlhttp.status 200 ||
     xmlhttp.status 304
  )
  

makes it impossible to use it offline via the file: protocol with gecko based browsers (tested with Firefox 1.0.7) as the returned xmlhttp.status is 0;

Fix:

  if(typeof xmlhttp.status 'undefined' ||
     !xmlhttp.status ||
     xmlhttp.status 200 ||
     xmlhttp.status 304
  )