function switch_database_city_select()
{
	document.getElementsByName('is_ville_db')[0].value=1 ;
	document.getElementById('tr_ville').style.display= 'none'; 
	document.getElementById('tr_id_ville').style.display='' ;
	document.getElementById('btn_post_code').style.display= 'inline'; 
}
function switch_manual_city_select()
{
	document.getElementsByName('is_ville_db')[0].value=0 ; 
	document.getElementById('tr_id_ville').style.display= 'none'; 
	document.getElementById('tr_ville').style.display= ''; 
	document.getElementById('btn_post_code').style.display='none' ;
}
function init_formulaire()
{
	document.getElementById('id_code_postal').value='' ;
}
function on_country_change( country ) 
{
	init_formulaire() ; 
	if( country == 74 ) //France
	{
		switch_database_city_select() ; 
	}
	else
	{
		switch_manual_city_select() ; 
	}
}