function selection_zone_geo (num_zone) {	
	
	var champs_destination = document.getElementById('destination');
	
	for(i_dest = 0; i_dest < champs_destination.length; i_dest++) {
	   if(champs_destination.options[i_dest].value == num_zone) {
	       champs_destination.options[i_dest].selected = true;	     
	   }
    }  
    
    document.getElementById('portail').submit();  
       
}