// -- personnals Functions
function toggleVisibility(objectID) {
	var object = document.getElementById(objectID);
	var state = object.style.visibility;
		if (state == 'hidden') 
		object.style.visibility = 'visible';
	else { 
		if (state == 'visible')  
		object.style.visibility = 'hidden';
	else object.style.visibility = 'visible';
	} 
	var state = object.style.visibility;
}