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@@ -6,6 +6,8 @@
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   * Added support for reading Mozilla cookie jars.  Thanks Chris Riddoch!
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   * Moving text, password, hidden, int to default.  Thanks Tim Harper!
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   * Mechanize#history_added callback for page loads. Thanks Tobi Reif!
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+  * Mechanize#scheme_handlers callbacks for handling unsupported schemes on
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+    links.
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 * Bug Fixes:
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   * Ignoring scheme case

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@@ -8,6 +8,7 @@
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 require 'www/mechanize/content_type_error'
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 require 'www/mechanize/response_code_error'
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+require 'www/mechanize/unsupported_scheme_error'
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 require 'www/mechanize/cookie'
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 require 'www/mechanize/cookie_jar'
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 require 'www/mechanize/history'
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@@ -71,6 +72,7 @@
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     attr_accessor :follow_meta_refresh
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     attr_accessor :verify_callback
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     attr_accessor :history_added
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+    attr_accessor :scheme_handlers
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     attr_reader :history
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     attr_reader :pluggable_parser
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@@ -125,6 +127,15 @@
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       @connection_cache = {}
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       @keep_alive_time  = 300
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       @keep_alive       = true
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+
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+      @scheme_handlers  = Hash.new { |h,k|
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+        h[k] = lambda { |link, page|
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+          raise UnsupportedSchemeError.new(k)
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+        }
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+      }
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+      @scheme_handlers['http']      = lambda { |link, page| link }
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+      @scheme_handlers['https']     = @scheme_handlers['http']
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+      @scheme_handlers['relative']  = @scheme_handlers['http']
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       yield self if block_given?
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     end
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@@ -420,6 +431,7 @@
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               )
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       end
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+      url = @scheme_handlers[url.relative? ? 'relative' : url.scheme.downcase].call(url, cur_page)
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       url.path = '/' if url.path.length == 0
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       # construct an absolute uri

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@@ -1 +1,11 @@
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+module WWW
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+  class Mechanize
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+    class UnsupportedSchemeError < RuntimeError
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+      attr_accessor :scheme
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+      def initialize(scheme)
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+        @scheme = scheme
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+      end
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+    end
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+  end
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+end

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@@ -12,6 +12,8 @@
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     <a href="link with space.html">not encoded space</a>
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     <!-- End escaped bug -->
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     <a href="unusual&&%3F%3F%23%23.html">unusual characters</a>
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+
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+    <a href="javascript:new_page('1')">javascript link</a>
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   </body>
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 </html>

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@@ -42,7 +42,7 @@
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   end
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   def test_unsupported_scheme
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-    assert_raise(RuntimeError) {
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+    assert_raise(WWW::Mechanize::UnsupportedSchemeError) {
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       @agent.get('ftp://server.com/foo.html')
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     }
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   end

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@@ -5,6 +5,21 @@
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     @agent = WWW::Mechanize.new
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   end
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+  def test_unsupported_link_types
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+    page = @agent.get("http://google.com/tc_links.html")
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+    link = page.links.text('javascript link').first
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+    assert_raise(WWW::Mechanize::UnsupportedSchemeError) {
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+      link.click
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+    }
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+
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+    @agent.scheme_handlers['javascript'] = lambda { |link, page|
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+      URI.parse('http://localhost/tc_links.html')
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+    }
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+    assert_nothing_raised {
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+      link.click
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+    }
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+  end
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+
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   def test_base
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     page = @agent.get("http://google.com/tc_base_link.html")
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     page = page.links.first.click