function openPole(id_pole) {
	var div = document.getElementById('pole_' + id_pole);
	div.style.display = 'block';
	switch(id_pole) {
		case 'agw' :
			var poles = new Array('inf', 'cad', 'autres');
			break;
		case 'inf' :
			var poles = new Array('agw', 'cad', 'autres');
			break;
		case 'cad' :
			var poles = new Array('inf', 'autres', 'agw');
			break;
		case 'autres' :
			var poles = new Array('inf', 'cad', 'agw');
			break;
	}
	for (var i = 0; i < poles.length; i++) {
		var div = document.getElementById('pole_' + poles[i]);
		div.style.display = 'none';
	}
	return false;
}