function change_region( selectbox ) {
var label;
var value;
var newopt;
var flag = true;


var selectarea2 = selectbox.options[ selectbox.selectedIndex ].value;

switch ( selectarea2 ) {
case "24":	label = new Array("-","Périgueux", "Brantôme" , "Les Eyzies"  , "Montbazillac", "Bergerac", "Nontron" , "Montpazier", "Sarlat" );
	value = new Array("0","39", "40", "41" ,"42", "43", "105", "104", "106");
	break;
case "33":	label = new Array("-","Bordeaux", "Arcachon", "Andernos", "Ares", "Cap Ferret" , "La Teste de Buch" , "Langon", "La Reole" , "Libourne", "Medoc", "Pauillac") ;
	value = new Array("0","26", "27", "29", "32", "28" , "31", "36", "37" , "38" , "33"  , "34"); 
	break;
case "40":	label = new Array("-","Biscarosse", "Capbreton", "Dax" , "Hagetmau" , "Hossegor" , "Mimizan", "Moliets" , "Mont de Marsan" );
	value = new Array("0","97", "45", "44", "103" ,"46", "100", "108", "47" );
	break;
case "47":	label = new Array("-","Agen", "Marmande", "Tonneins", "Villeneuve sur Lot" );
	value = new Array("0","98", "109", "111", "112" );
	break;		
case "64":	label = new Array("-", "Anglet" , "Ascain", "Biarritz", "Bayonne", "Boucau" , "Hendaye" , "Laruns" , "Oloron-Ste-Marie" , "Ondres" , "Orthez" , "Pau" , "St Jean-de Luz" , "St-Jean-Pied-de-Port");
	value = new Array("0","52", "54", "51", "53" ,"55","99","113", "60", "56", "58", "59", "50", "57");
	break;

default :  label = new Array( "-");
	value = new Array( "0");
	break;
}

var selbox2 = document.forms[0].villep;
for ( var i = selbox2.options.length - 1; i >= 0; i-- ) {
	selbox2.options[ i ] = null;
	}

for ( var j = 0; j < label.length; j++ ) {
	newopt = new Option ( label[ j ], value[ j ], false, false );
	selbox2.options[ j ] = newopt;
	}
}