logJsErrors.js

window.onerror = function(msg, url, line) {
  var loggerUrl = "/log/js";
	var parameters = "?description=" + escapemsg
		+ "&url=" + escape(url)
		+ "&line=" + escape(line)
		+ "&parent_url=" + escape(document.location.href)
		+ "&user_agent=" + escape(navigator.userAgent);
 
	/* Send error to the server by loading this as a image url. It will work as a GET request */
	new Image().src = loggerUrl + parameters;
};

// Not using image
window.onerror = function(msg, url, line)
  {
    if(encodeURIComponent) {
      var req = new AjaxRequest();
      var params = "msg=" + encodeURIComponent(msg) + '&url=' + encodeURIComponent(url) + "&line=" + line;
      req.setMethod("POST");
      return req.loadXMLDoc("/log/js/", params);
    }
    return false;
  }