diff --git a/commands.c b/commands.c
index 8a1c06a..4c9553e 100644
--- a/commands.c
+++ b/commands.c
@@ -35,6 +35,7 @@ void load_image(int);
 void redraw();
 void reset_cursor();
 void animate();
+void slideshow();
 void set_timeout(timeout_f, int, int);
 void reset_timeout(timeout_f);
 
@@ -57,6 +58,10 @@ int it_switch_mode(arg_t a) {
 			tns_init(&tns, filecnt);
 		img_close(&img, 0);
 		reset_timeout(reset_cursor);
+		if (img.slideshow) {
+			img.slideshow = 0;
+			reset_timeout(slideshow);
+		}
 		tns.sel = fileidx;
 		tns.dirty = 1;
 		mode = MODE_THUMB;
@@ -168,12 +173,11 @@ int i_toggle_animation(arg_t a) {
 	if (img.multi.animate) {
 		reset_timeout(animate);
 		img.multi.animate = 0;
-		return 0;
 	} else {
 		delay = img_frame_animate(&img, 1);
 		set_timeout(animate, delay, 1);
-		return 1;
 	}
+	return 1;
 }
 
 int it_move(arg_t a) {
@@ -318,6 +322,46 @@ int i_rotate(arg_t a) {
 	return 0;
 }
 
+int i_toggle_slideshow(arg_t a) {
+	if (mode == MODE_IMAGE) {
+		if (img.slideshow) {
+			img.slideshow = 0;
+			reset_timeout(slideshow);
+			return 1;
+		} else if (fileidx + 1 < filecnt) {
+			img.slideshow = 1;
+			set_timeout(slideshow, img.ss_delay, 1);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+int i_adjust_slideshow(arg_t a) {
+	long d = (long) a;
+	int i, delays[] = { 1, 2, 3, 5, 10, 15, 20, 30, 60, 120, 180, 300, 600 };
+
+	if (mode != MODE_IMAGE || !img.slideshow)
+		return 0;
+
+	if (d < 0) {
+		for (i = ARRLEN(delays) - 2; i >= 0; i--) {
+			if (img.ss_delay > delays[i] * 1000) {
+				img.ss_delay = delays[i] * 1000;
+				return 1;
+			}
+		}
+	} else {
+		for (i = 1; i < ARRLEN(delays); i++) {
+			if (img.ss_delay < delays[i] * 1000) {
+				img.ss_delay = delays[i] * 1000;
+				return 1;
+			}
+		}
+	}
+	return 0;
+}
+
 int i_toggle_antialias(arg_t a) {
 	if (mode == MODE_IMAGE) {
 		img_toggle_antialias(&img);
@@ -365,14 +409,14 @@ int it_shell_cmd(arg_t a) {
 	n = mode == MODE_IMAGE ? fileidx : tns.sel;
 
 	if (setenv("SXIV_IMG", files[n].path, 1) < 0) {
-		warn("could not change env.-variable: SXIV_IMG. command line was: %s",
+		warn("could not set env.-variable: SXIV_IMG. command line was: %s",
 		     cmdline);
 		return 0;
 	}
 
 	if ((pid = fork()) == 0) {
 		execl("/bin/sh", "/bin/sh", "-c", cmdline, NULL);
-		warn("could not exec: /bin/sh");
+		warn("could not exec: /bin/sh. command line was: %s", cmdline);
 		exit(1);
 	} else if (pid < 0) {
 		warn("could not fork. command line was: %s", cmdline);
diff --git a/commands.h b/commands.h
index 580ea82..e038246 100644
--- a/commands.h
+++ b/commands.h
@@ -57,6 +57,8 @@ int i_zoom(arg_t);
 int i_fit_to_win(arg_t);
 int i_fit_to_img(arg_t);
 int i_rotate(arg_t);
+int i_toggle_slideshow(arg_t);
+int i_adjust_slideshow(arg_t);
 int i_toggle_antialias(arg_t);
 int it_toggle_alpha(arg_t);
 int it_open_with(arg_t);
diff --git a/config.def.h b/config.def.h
index d5a9463..50cecb8 100644
--- a/config.def.h
+++ b/config.def.h
@@ -29,6 +29,9 @@ static const float zoom_levels[] = {
 	100.0, 150.0, 200.0, 400.0, 800.0
 };
 
+/* default slideshow delay (in sec, overwritten via -S option): */
+enum { SLIDESHOW_DELAY = 5 };
+
 /* default settings for multi-frame gif images: */
 enum {
 	GIF_DELAY    = 100, /* delay time (in ms) */
@@ -104,6 +107,11 @@ static const keymap_t keys[] = {
 	{ False,  XK_less,          i_rotate,             (arg_t) DIR_LEFT },
 	{ False,  XK_greater,       i_rotate,             (arg_t) DIR_RIGHT },
 
+	{ False,  XK_s,             i_toggle_slideshow,   (arg_t) None },
+	{ True,   XK_plus,          i_adjust_slideshow,   (arg_t) +1 },
+	{ True,   XK_equal,         i_adjust_slideshow,   (arg_t) +1 },
+	{ True,   XK_minus,         i_adjust_slideshow,   (arg_t) -1 },
+
 	{ False,  XK_a,             i_toggle_antialias,   (arg_t) None },
 	{ False,  XK_A,             it_toggle_alpha,      (arg_t) None },
 
diff --git a/image.c b/image.c
index 20c4ff3..7402835 100644
--- a/image.c
+++ b/image.c
@@ -56,6 +56,8 @@ void img_init(img_t *img, win_t *win) {
 		img->zoom = MIN(img->zoom, zoom_max);
 		img->aa = options->aa;
 		img->alpha = 1;
+		img->slideshow = 0;
+		img->ss_delay = SLIDESHOW_DELAY * 1000;
 	}
 
 	if (win) {
@@ -651,7 +653,7 @@ int img_frame_animate(img_t *img, int restart) {
 		return 0;
 
 	if (img->multi.sel + 1 >= img->multi.cnt) {
-		if (restart || GIF_LOOP) {
+		if (restart || (GIF_LOOP && !img->slideshow)) {
 			img_frame_goto(img, 0);
 		} else {
 			img->multi.animate = 0;
@@ -660,7 +662,6 @@ int img_frame_animate(img_t *img, int restart) {
 	} else if (!restart) {
 		img_frame_goto(img, img->multi.sel + 1);
 	}
-
 	img->multi.animate = 1;
 
 	return img->multi.frames[img->multi.sel].delay;
diff --git a/image.h b/image.h
index 558e3c2..ddbdb9d 100644
--- a/image.h
+++ b/image.h
@@ -49,6 +49,9 @@ typedef struct {
 	unsigned char aa;
 	unsigned char alpha;
 
+	unsigned char slideshow;
+	int ss_delay; /* in ms */
+
 	int x;
 	int y;
 	int w;
diff --git a/main.c b/main.c
index ebb6e7d..c96a030 100644
--- a/main.c
+++ b/main.c
@@ -53,6 +53,7 @@ typedef struct {
 void redraw();
 void reset_cursor();
 void animate();
+void slideshow();
 
 appmode_t mode;
 img_t img;
@@ -68,7 +69,8 @@ char win_title[TITLE_LEN];
 timeout_t timeouts[] = {
 	{ { 0, 0 }, False, redraw },
 	{ { 0, 0 }, False, reset_cursor },
-	{ { 0, 0 }, False, animate }
+	{ { 0, 0 }, False, animate },
+	{ { 0, 0 }, False, slideshow },
 };
 
 void cleanup() {
@@ -216,8 +218,10 @@ void load_image(int new) {
 
 void update_title() {
 	int n;
-	float size;
-	const char *unit;
+	char sshow_info[16];
+	char frame_info[16];
+	float size, time;
+	const char *size_unit, *time_unit;
 
 	if (mode == MODE_THUMB) {
 		n = snprintf(win_title, TITLE_LEN, "sxiv: [%d/%d] %s",
@@ -225,18 +229,27 @@ void update_title() {
 		             tns.cnt ? files[tns.sel].name : "");
 	} else {
 		size = filesize;
-		size_readable(&size, &unit);
+		size_readable(&size, &size_unit);
+
+		if (img.slideshow) {
+			time = img.ss_delay / 1000.0;
+			time_readable(&time, &time_unit);
+			snprintf(sshow_info, sizeof(sshow_info), "*%d%s* ",
+			         (int) time, time_unit);
+		} else {
+			sshow_info[0] = '\0';
+		}
 		if (img.multi.cnt)
-			n = snprintf(win_title, TITLE_LEN,
-			             "sxiv: [%d/%d] <%d%%> <%dx%d> (%.2f%s) {%d/%d} %s",
-			             fileidx + 1, filecnt, (int) (img.zoom * 100.0), img.w,
-			             img.h, size, unit, img.multi.sel + 1, img.multi.cnt,
-			             files[fileidx].name);
+			snprintf(frame_info, sizeof(frame_info), "{%d/%d} ",
+			         img.multi.sel + 1, img.multi.cnt);
 		else
-			n = snprintf(win_title, TITLE_LEN,
-			             "sxiv: [%d/%d] <%d%%> <%dx%d> (%.2f%s) %s",
-			             fileidx + 1, filecnt, (int) (img.zoom * 100.0), img.w,
-			             img.h, size, unit, files[fileidx].name);
+			frame_info[0] = '\0';
+
+		n = snprintf(win_title, TITLE_LEN,
+		             "sxiv: [%d/%d] <%dx%d:%d%%> (%.2f%s) %s%s%s",
+		             fileidx + 1, filecnt, img.w, img.h,
+		             (int) (img.zoom * 100.0), size, size_unit,
+		             sshow_info, frame_info, files[fileidx].name);
 	}
 
 	if (n >= TITLE_LEN) {
@@ -248,10 +261,17 @@ void update_title() {
 }
 
 void redraw() {
-	if (mode == MODE_IMAGE)
+	if (mode == MODE_IMAGE) {
 		img_render(&img, &win);
-	else
+		if (img.slideshow && !img.multi.animate) {
+			if (fileidx + 1 < filecnt)
+				set_timeout(slideshow, img.ss_delay, 1);
+			else
+				img.slideshow = 0;
+		}
+	} else {
 		tns_render(&tns, &win);
+	}
 	update_title();
 	reset_timeout(redraw);
 	reset_cursor();
@@ -282,9 +302,19 @@ void animate() {
 	int delay;
 
 	delay = img_frame_animate(&img, 0);
-	if (delay) {
+	redraw();
+	if (delay)
 		set_timeout(animate, delay, 1);
-		redraw();
+}
+
+void slideshow() {
+	if (mode == MODE_IMAGE && !img.multi.animate) {
+		if (fileidx + 1 < filecnt) {
+			load_image(fileidx + 1);
+			redraw();
+		} else {
+			img.slideshow = 0;
+		}
 	}
 }
 
diff --git a/options.c b/options.c
index 8532be1..1e4a56c 100644
--- a/options.c
+++ b/options.c
@@ -54,23 +54,22 @@ void print_version() {
 }
 
 void parse_options(int argc, char **argv) {
-	float z;
-	int n, opt;
+	int opt, t;
 
+	_options.recursive = 0;
 	_options.startnum = 0;
 
 	_options.scalemode = SCALE_MODE;
 	_options.zoom = 1.0;
 	_options.aa = 1;
-	_options.thumbnails = 0;
 
 	_options.fixed = 0;
 	_options.fullscreen = 0;
 	_options.geometry = NULL;
 
 	_options.quiet = 0;
+	_options.thumbnails = 0;
 	_options.clean_cache = 0;
-	_options.recursive = 0;
 
 	while ((opt = getopt(argc, argv, "cdFfg:hn:pqrstvZz:")) != -1) {
 		switch (opt) {
@@ -96,12 +95,12 @@ void parse_options(int argc, char **argv) {
 				print_usage();
 				exit(0);
 			case 'n':
-				if (!sscanf(optarg, "%d", &n) || n < 1) {
+				if (!sscanf(optarg, "%d", &t) || t < 1) {
 					fprintf(stderr, "sxiv: invalid argument for option -n: %s\n",
 					        optarg);
 					exit(1);
 				} else {
-					_options.startnum = n - 1;
+					_options.startnum = t - 1;
 				}
 				break;
 			case 'p':
@@ -128,12 +127,12 @@ void parse_options(int argc, char **argv) {
 				break;
 			case 'z':
 				_options.scalemode = SCALE_ZOOM;
-				if (!sscanf(optarg, "%f", &z) || z < 0) {
+				if (!sscanf(optarg, "%d", &t) || t <= 0) {
 					fprintf(stderr, "sxiv: invalid argument for option -z: %s\n",
 					        optarg);
 					exit(1);
 				}
-				_options.zoom = z / 100.0;
+				_options.zoom = (float) t / 100.0;
 				break;
 		}
 	}
diff --git a/options.h b/options.h
index d32d37a..67ad926 100644
--- a/options.h
+++ b/options.h
@@ -23,23 +23,27 @@
 #include "types.h"
 
 typedef struct {
+	/* file list: */
 	char **filenames;
 	unsigned char from_stdin;
+	unsigned char recursive;
 	int filecnt;
 	int startnum;
 
+	/* image: */
 	scalemode_t scalemode;
 	float zoom;
 	unsigned char aa;
-	unsigned char thumbnails;
 
+	/* window: */
 	unsigned char fixed;
 	unsigned char fullscreen;
 	char *geometry;
 
+	/* misc flags: */
 	unsigned char quiet;
+	unsigned char thumbnails;
 	unsigned char clean_cache;
-	unsigned char recursive;
 } options_t;
 
 extern const options_t *options;
diff --git a/util.c b/util.c
index bc7c2e1..99166f8 100644
--- a/util.c
+++ b/util.c
@@ -127,8 +127,17 @@ void size_readable(float *size, const char **unit) {
 	const char *units[] = { "", "K", "M", "G" };
 	int i;
 
-	for (i = 0; i < ARRLEN(units) && *size > 1024; i++)
-		*size /= 1024;
+	for (i = 0; i < ARRLEN(units) && *size > 1024.0; i++)
+		*size /= 1024.0;
+	*unit = units[MIN(i, ARRLEN(units) - 1)];
+}
+
+void time_readable(float *time, const char **unit) {
+	const char *units[] = { "s", "m", "h" };
+	int i;
+
+	for (i = 0; i < ARRLEN(units) && *time >= 60.0; i++)
+		*time /= 60.0;
 	*unit = units[MIN(i, ARRLEN(units) - 1)];
 }
 
diff --git a/util.h b/util.h
index cc4da88..8155613 100644
--- a/util.h
+++ b/util.h
@@ -65,6 +65,7 @@ void die(const char*, ...);
 ssize_t get_line(char**, size_t*, FILE*);
 
 void size_readable(float*, const char**);
+void time_readable(float*, const char**);
 
 char* absolute_path(const char*);