var DEBUG = (window.location.search.indexOf('debug') > 0);
var DEBUG_MESSAGE_TYPES = ["ERROR","WARNING","STATUS","LAYOUT","INFO"];
var debug_win;

function debug(message_type, message) {
	if (DEBUG && (DEBUG_MESSAGE_TYPES.join(" ").indexOf(message_type) > -1 )) {
		if (!debug_win) {
			debug_win = window.open("","","");
			debug_win.document.open();
		}
		message = message.replace(/</g, "&lt;");
		message = message.replace(/>/g, "&gt;");
		
		try {
			debug_win.document.write("");
		} catch(e) {
			debug_win = window.open("","","");
			debug_win.document.open();			
		}

		debug_win.document.write("<h1 style='font-size: 80%; margin:0;border-bottom: 1px solid #CCC;'>" + message_type  + "</h1>");
		debug_win.document.write("<pre style='font-size: 85%; margin: .5em 0 2em 0;'>" + message + "</pre>");
	}
} // END: debug()


// extension of an idea from simon willison
// http://simon.incutio.com/archive/2004/05/26/addLoadEvent
// adds function call to an arbitrary window event trigger
function addWindowEvent(event_name, function_to_add) {
  var current_event = window[event_name];

  if (typeof(current_event) != 'function') {
    window[event_name] = function_to_add;

  } else {
    window[event_name] = function() {
      current_event();
      function_to_add();
    };
  }
} // END: addWindowEvent()