rem: void met_en_prelight ( GtkWidget *event_box, GdkEventMotion *event, gpointer pointeur )
add: gboolean met_en_prelight ( GtkWidget *event_box, GdkEventMotion *event, gpointer pointeur )
context: void met_en_prelight ( GtkWidget *event_box,			GdkEventMotion *event,			gpointer pointeur ){  gtk_widget_set_state ( GTK_WIDGET ( GTK_BIN (event_box)->child ),			 GTK_STATE_PRELIGHT );}