I would like to make the browser toolbar as the Google toolbar for my site. It must be compatible with all popular browsers.
What language should I use it in? Are there any examples / guides that I could use?
For Firefox, start here: https://developer.mozilla.org/en/Extensions
Internet Explorer, here: http://msdn.microsoft.com/en-us/library/bb250489%28VS.85%29.aspx
You can use Javascript and Xml ( XUL ) to write Firefox extensions and any language that can generate a COM component that implements the IObjectWithSite interface (VB, C ++, C # ...) for IE.
IE examples:
Firefox:
The browser toolbar is not compatible with other browsers. Some toolbars provide you with a different download link based on your browser, while others install plugins for each browser that they recognize and detect.
But no matter what, you will write one for each browser that you want to support if they do not share the plugin model.
See Corbin answer for ie and firefox, for safari, start with:
http://developer.apple.com/documentation/InternetWeb/Conceptual/WebKit_PluginProgTopic/Tasks/WebKitPlugins.html
You can make one toolbar compatible with IE and Firefox. You need to create two toolbars.
For IE, you need to create Deskband ( http://www.codeproject.com/KB/shell/ietoolbartutorial.aspx ), a kind of plugin that interacts with IE through COM. For this you need to know C ++ and COM.
For Firefox, you need to create a Firefox extension. https://developer.mozilla.org/en/Extensions is a good place to start. You need to know JavaScript and XUL (the XML user interface language that Mozilla uses to create user interfaces)
Have you tried http://www.Conduit.com/ ? It is completely free! I like it. Even big guys use it.
As for your game ... Is it available online? Can I play it?