// JavaScript Document
function cambiar_estilo(id_obj, class_name)
{
	var obj;
	obj =	document.getElementById(id_obj);
	if (obj != null)
	{
		obj.className = class_name;
	}
	return true;
} 

function cambiar_estilo_comprobando(id_obj, class_name)
{
	var obj;
	obj =	document.getElementById(id_obj);
	if (obj != null)
	{
		if (obj_sel != obj)
		{
			obj.className = class_name;
		}
	}
	return true;
}

function mantener_estilo(id_obj, class_name_resaltada, class_name)
{
	var obj;
	
	obj =	document.getElementById(id_obj);
	if (obj != null)
	{
		if (obj != obj_sel)
		{
			obj.className = class_name_resaltada;
			if (obj_sel!=null)
			{
				obj_sel.className = class_name
			}
			obj_sel = obj;
		}
	}
	return true		
}