You can change the "text" variable in the browser. This is an API that you can throw text at and try and detect the sentiment.

Examples: http://happy.elevenbasetwo.com/?text=I%20want%20to%20go%20ho.... http://happy.elevenbasetwo.com/?text=You%20guys%20are%20amaz...!

http://happy.elevenbasetwo.com/?text=bill%20gates http://happy.elevenbasetwo.com/?text=linus%20torvalds