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

function geticonJSON( filename ){
	var postString = "file=" + datafilename;
	new ajax( 'icon_json.php' , {postBody: postString, onComplete: result_json});
}

function result_json(request){
	returnedresult = request.responseText;
	processJSON(returnedresult);
}

function show_window(id) {
	document.getElementById('map').style.display = "block";
/*	document.getElementById('mapexamples').style.display = "none"; */
	document.getElementById('mapinstructions').style.display = "none";

	if ( id == 'map' )	{}
/*	else if (id == 'mapexamples' )	{document.getElementById('mapexamples').style.display = "block";} */
	else if (id == 'mapinstructions' )	{document.getElementById('mapinstructions').style.display = "block";	}
}