function flash(id) {
	flash2(id, 0, document.getElementById(id).style.backgroundColor);
	//flash2(id, 0, 'white');
}

function flash2(id, cnt, bg) {
	document.getElementById(id).style.backgroundColor = ((cnt++ % 2) ? "red" : bg);
	if ( cnt < 7 )
		setTimeout("flash2('" + id + "'," + cnt + ",'" + bg + "')", 250);
}