var loading_graphic = new Image();
loading_graphic.src = '/images/loading.gif';

function displayLoadingGraphic( button ) {
	
	var loading_block = document.createElement('div');
	loading_block.className = 'loading';
	loading_block.appendChild( loading_graphic );
	button.parentNode.appendChild( loading_block );
	button.style.display = 'none';
	button.style.visibility = 'hidden';
}

function sleep(milliseconds) {
  var start = new Date().getTime();
  for (var i = 0; i < 1e7; i++) {
    if ((new Date().getTime() - start) > milliseconds){
      break;
    }
  }
}

/* DISPLAY PAGE HIGHLIGHT HANDLERS.
ALL MODULES WISHING TO DISPLAY PAGE HIGHLIGHTS ON MENU MOUSEOVER MUST REGISTER THEIR HANDLERS HERE
*/
var page_highlights_handlers = new Array();
function registerPageHighlightsHandler( handler )
{
	page_highlights_handlers;

	page_highlights_handlers[page_highlights_handlers.length] = handler;
}
function displayPageHighlights( page_id )
{
	page_highlights_handlers;

	var c;
	for ( c = 0; c < page_highlights_handlers.length; c++ )
	{
		page_highlights_handlers[c].displayPageHighlights( page_id );
	}

	return true;
}