var tableLayer4 = new Array("dv_taxi","dv_moto","dv_bureau");
function hidelayer(id){
	if (id == 4){
		for(i=0;i<tableLayer4.length;i++)
			document.getElementById(tableLayer4[i]).style.display = "none";
	}
}
function showLayer(id,table){
	hidelayer(table);
	document.getElementById(id).style.display = "block";
}