function showHide(obj_id)
{
	obj = document.getElementById(obj_id);
	img = document.getElementById('tar_centrala_img');

	if (obj.style.display == 'block')
	{
		obj.style.display = 'none'
		img.src = '/content/repository/images/de_en/gfx/m4_centrala_off.gif'
	}
	else
	{
		obj.style.display = 'block'
		img.src = '/content/repository/images/de_en/gfx/m4_centrala_on.gif'
	}
}