fileselection question

[A R Hummaida <hummaida cs man ac uk>]

  dear all

well this question is kind of related to the file selection widget.
i have the following


GList *my_selection_list; //global

// call back for ok button on file selection

void on_file_selection_ok_button_clicked (GtkWidget * w,  gpointer 
user_data)
{
.
.
gchar *file_selected ;

 file_selected =
   gtk_file_selection_get_filename (GTK_FILE_SELECTION  
(file_selection_widget));
.
.
.
if (g_list_find(my_selection_list,file_selected)==NULL)
       {       
 my_selection_list=g_list_append (my_selection_list,file_selected);
g_print("file selected is %s\n",file_selected);
.
.

      }
}

so i want a file to be selected only once.this works the first time as 
the list is empty but next tries don't
print the file name even though a different file is selected. i have 
tried many of these glist functions to no avail. please help

Thanks