function getById(id){
	return document.getElementById(id);
}

/*networking info*/
var file_name = 'location.php';
var tmp_text = 'loading';
function changeSubField(id_field){
	
	role_obj = getById('role');
	role_obj.innerHTML = '';
	
	str = 'sel=get_netw_fields&par=id_sub_field&id_spr='+id_field;
	destination_obj = getById('sub_field');
	anisochronous = true;
	ajaxRequest(file_name, str, destination_obj, tmp_text, anisochronous);
}
function changeRole(id_sub_field){
	str = 'sel=get_netw_fields&par=id_role&id_spr='+id_sub_field;
	destination_odj = getById('role');
	anisochronous = true;
	ajaxRequest(file_name, str, destination_odj, tmp_text, anisochronous);
}