fixes issue #602

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    compass (0.12.alpha.0.a00044c)
+    compass (0.12.alpha.0.eb10566)
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
       sass (~> 3.1)

lib/compass/sass_extensions/functions/sprites.rb

@@ -153,10 +153,14 @@ module Compass::SassExtensions::Functions::Sprites
 protected
 
   def convert_sprite_name(sprite)
-    if sprite.is_a?(Sass::Script::Color)
+    case sprite
-      return Sass::Script::String.new(Sass::Script::Color::HTML4_COLORS_REVERSE[sprite.rgb])
+      when Sass::Script::Color
+        Sass::Script::String.new(Sass::Script::Color::HTML4_COLORS_REVERSE[sprite.rgb])
+      when Sass::Script::Bool
+        Sass::Script::String.new(sprite.to_s)
+      else
+        sprite
     end
-    sprite
   end
 
   def verify_map(map, error = "sprite")

test/integrations/sprites_test.rb

@@ -664,6 +664,20 @@ class SpritesTest < Test::Unit::TestCase
     assert_equal 2, map_files('selectors-s*.png').size, "File was removed"
   end
   
+  it "should generate a sprite if the sprite is a bool" do
+    css = render <<-SCSS
+      @import "bool/*.png";
+      a {
+        @include bool-sprite(false);
+      }
+      a {
+        @include bool-sprite(true);
+      }
+    SCSS
+    assert !css.empty?
+  end
+  
+  
   it "should generate a sprite if the sprite is a colorname" do
     css = render <<-SCSS
       @import "colors/*.png";