function hidden_message() {
	return setTimeout(function() {
		var nodes = document.getElementsByTagName("p") ;
		for(var i = 0 ; i < nodes.length ; i++) {
			var node = nodes[i] ;
			if((typeof(node.className) != "undefined") && node.className == "message") {
				node.style.display = "none" ;
			}
		}
	}, 5000) ;
}