// the functions in this file require the supplementary library lib.js

// These defaults should be changed the way it best fits your site
var _POPUP_FEATURES = 'height=550,width=700,left=100,top=100,resizable=yes,scrollbars=yes,toolbar=no,status=no';

function raw_popup(url, target, features) {
  // pops up a window containing url optionally named target, optionally having features
  if (isUndefined(features)) features = _POPUP_FEATURES;
  if (isUndefined(target  )) target = '_blank';
  var theWindow = window.open(url, target, features);
  theWindow.focus();
  return theWindow;
}

function link_popup(src, features) {
  // to be used in an html event handler as in: <a href="..." onclick="link_popup(this,...)" ...
  // pops up a window grabbing the url from the event source's href
  return raw_popup(src.getAttribute('href'), src.getAttribute('target') || '_blank', features);
}

function event_popup(e) {
  // to be passed as an event listener
  // pops up a window grabbing the url from the event source's href
  link_popup(e.currentTarget);
  e.preventDefault();
}

function event_popup_features(features) {
  // generates an event listener similar to event_popup, but allowing window features
  return function(e) { link_popup(e.currentTarget, features); e.preventDefault() }
}