case 'J':
	        {
			int h = fz_pixmap_height(app->ctx, app->image);
			if (h <= app->winh || app->pany <= app->winh - h)
			{
				panto = PAN_TO_TOP;
				app->pageno++;
			}
			else
			{
				app->pany -= app->winh;
				pdfapp_showpage(app, 0, 0, 1, 0, 0);
			}
			break;
		}

	case 'K':
	        {
			int h = fz_pixmap_height(app->ctx, app->image);
			if (h <= app->winh || app->pany == 0)
			{
				panto = PAN_TO_BOTTOM;
				app->pageno--;
			}
			else
			{
				app->pany += app->winh;
				pdfapp_showpage(app, 0, 0, 1, 0, 0);
			}
			break;
		}