drawing area transparency

["Blowfish" <blow_fish telkom net>]

i've figure out that setting back pixmap with NULL 
filename will make the drawing area transparent... but how 
can i update the transparency when i move my window ???


GtkWidget *logo_drawingarea;
GdkPixmap *pixmap;

logo_drawingarea = lookup_widget((GtkWidget *) coreWindow, 
"logo_drawingarea");

pixmap = gdk_pixmap_create_from_xpm 
    (logo_drawingarea->window,
                                             NULL,
                                             NULL,
                                             NULL); 

gdk_window_set_back_pixmap(logo_drawingarea->window, 
pixmap,0);

gdk_window_clear(logo_drawingarea->window);
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