diff --git a/simpleanimation.py b/simpleanimation.py
index a23e828..1999d28 100644
--- a/simpleanimation.py
+++ b/simpleanimation.py
@@ -1,27 +1,8 @@
 import sys
 import pygame
 
-from utils import Timer
-
-
-class SimpleAnimation(object):
-    """ A simple animation. Scrolls cyclically through a list of
-        images, drawing them onto the screen in the same posision.    
-    """
+class SimpleAnimation:
     def __init__(self, screen, pos, images, scroll_period, duration=-1):
-        """ Create an animation.        
-            
-            screen: The screen to which the animation will be drawn
-            pos: Position on the screen
-            images: 
-                A list of surface objects to cyclically scroll through
-            scroll_period: 
-                Scrolling period (in ms)
-            duration:
-                Duration of the animation (in ms). If -1, the 
-                animation will have indefinite duration.
-        """
-	print "starting animation."
         self.screen = screen
         self.images = images
         self.pos = pos
@@ -29,66 +10,56 @@ def __init__(self, screen, pos, images, scroll_period, duration=-1):
         self.active = True
         self.duration = duration
         
-        self.scroll_timer = Timer(scroll_period, self._advance_img)
-        self.active_timer = Timer(duration, self._inactivate, True)
+        self.scroll_timer = scroll_period
+        self.active_timer = duration
+        
+        self.scroll_time_passed = 0
+        self.active_time_passed = 0
     
     def is_active(self):
-        """ Is the animation active ?
-        
-            An animation is active from the moment of its creation
-            and until the duration has passed.
-        """
         return self.active
     
     def update(self, time_passed):
-        """ Update the animation's state.
+        self.scroll_time_passed += time_passed
+        self.active_time_passed += time_passed
+        
+        if self.scroll_time_passed >= self.scroll_timer:
+            self._advance_img()
+            self.scroll_time_passed = 0
         
-            time_passed:
-                The time passed (in ms) since the previous update.
-        """
-        for timer in [self.scroll_timer, self.active_timer]:
-            timer.update(time_passed)
+        if self.duration >= 0 and self.active_time_passed >= self.active_timer:
+            self.active = False
 
     def draw(self):
-        """ Draw the animation onto the screen.
-        """
         if self.active:
             cur_img = self.images[self.img_ptr]
-            self.draw_rect = cur_img.get_rect().move(self.pos)
-            self.screen.blit(cur_img, self.draw_rect)
+            draw_rect = cur_img.get_rect().move(self.pos)
+            self.screen.blit(cur_img, draw_rect)
             
-    def _inactivate(self):
-        if self.duration >= 0:
-            self.active = False
-    
     def _advance_img(self):
         self.img_ptr = (self.img_ptr + 1) % len(self.images)
 
-class start():
-	if __name__ == "__main__":
-	    print "initializing"
-	    pygame.init()
-	    screen = pygame.display.set_mode((300, 300), 0, 32)
-
-	    clock = pygame.time.Clock()
-	    explosion_img = pygame.image.load('images/explosion1.png').convert_alpha()
-	    images = [explosion_img, pygame.transform.rotate(explosion_img, 90)]
-
-	    expl = SimpleAnimation(screen, (100, 100), images, 100, 2120)
-
-	    while True:
-		time_passed = clock.tick(50)
-		
-		screen.fill((0, 0, 0))
-		
-		for event in pygame.event.get():
-		    if event.type == pygame.QUIT:
-			sys.exit()
-		
-		expl.update(time_passed)
-		expl.draw()
-		
-		pygame.display.flip()
-
-go = start()
-
+if __name__ == "__main__":
+    pygame.init()
+    screen = pygame.display.set_mode((300, 300))
+    clock = pygame.time.Clock()
+    
+    explosion_img = pygame.image.load('images/explosion1.png').convert_alpha()
+    images = [explosion_img, pygame.transform.rotate(explosion_img, 90)]
+    
+    expl = SimpleAnimation(screen, (100, 100), images, 100, 2120)
+    
+    while True:
+        time_passed = clock.tick(50)
+        
+        screen.fill((0, 0, 0))
+        
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                pygame.quit()
+                sys.exit()
+        
+        expl.update(time_passed)
+        expl.draw()
+        
+        pygame.display.flip()