var _backup_header_infos_text;
var _current_header_infos_text;

function display_header_infos_text(text) {
	var el = document.getElementById('header_infos_text');
	if (_current_header_infos_text == text) {
		el.innerHTML=_backup_header_infos_text;
		_current_header_infos_text='';
	}
	else {
		_backup_header_infos_text = el.innerHTML;
		el.innerHTML='<img src="graph/info.png" alt="?" title="?" /> ' + text;
		el.innerHTML=text;
		_current_header_infos_text = text;
	}
}

function reset_header_infos_text() {
	var el = document.getElementById('header_infos_text');
	el.innerHTML = _backup_header_infos_text; 
}