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<!DOCTYPE html>
<html>
<head>
<script>
onerror = handleErr;
var txt = "";
function handleErr(msg, url, l) {
  txt = "There was an error on this page.\n\n";
  txt += "Error: " + msg + "\n";
  txt += "URL: " + url + "\n";
  txt += "Line: " + l + "\n\n";
  txt += "Click OK to continue.\n\n";
  alert(txt);
  return true;
}
​
function message() {
   adddlert("Welcome guest!");
}
</script>
</head>
​
<body>
<input type="button" value="View message" onclick="message()" />
</body>
​
</html>
​