/* Custom showHideLayer */
function hideLayer(id){
	document.getElementById(id).style.visibility = 'hidden';
	return false;
}
function hideAllLayers(){
	t_classes = document.getElementsByClassName('navigUl');
	for(i=0; i<t_classes.length; i++){
		t_classes[i].style.visibility = 'hidden';
	}
	return false;	
}
function showLayer(id){
	hideAllLayers(); // On masque tous les zoom
	document.getElementById(id).style.visibility = 'visible';
	return false;
}

document.getElementsByClassName = function(className){
	var MyClassArray = getElementsByClassName(className, this);
	return MyClassArray;
}
function getElementsByClassName (className, theElement){
	var elts = theElement.getElementsByTagName('*');
	var classArray = new Array();
	for (var j = 0; j < elts.length; ++j) {
	if (elts[j].className.indexOf(className) != -1) {
			classArray.push(elts[j]);
		}
	}
	return classArray;
}