function ti_cities_update(the_val,the_field,langue){
	
	if(the_field){
		the_field.options.length = 0;	
	var url = "/ajax.php?todo=get_cities&langue="+langue+"&pays="+the_val;
	var my_new_array=new Json.Remote(url,{
		onComplete: function(jsonObj){
			i=0;
			jsonObj.datas.each(function(uoption){
				if(the_field)
				the_field.options[i]=new Option(uoption.value,uoption.id);
				i++;
			});
		}
	
	}).send();
	}
}