var a1 = new Image().src = "images/a1.gif"
var bbg1 = new Image().src = "images/bbg1.gif"
var bbg2 = new Image().src = "images/bbg2.gif"

addLoadEvent(externalLinks);

function externalLinks() {
  if (!document.getElementsByTagName) return;
  var anchors = document.getElementsByTagName("a");
  for (var i=0; i<anchors.length; i++) {
    var anchor = anchors[i];
    if (anchor.getAttribute("href") &&
      anchor.getAttribute("rel") == "external")
      anchor.target = "_blank";
    }
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function disp_alert(alert_type) {
  switch (alert_type) {
    case "locked":
      alert("This document is password-protected.\nContact cutler@eecg.toronto.edu for access.")
      break;
    default:
  }
}