Just ran across this Firefox add-on rikaichan that translates Japanese text when you hover over it
[url:1qj3jyjg]http://www.polarcloud.com/rikaichan/[/url:1qj3jyjg]
[i:1qj3jyjg]now available for chrome[/i:1qj3jyjg]
[url:1qj3jyjg]https://chrome.google.com/extensions/detail/jipdnfibhldikgcjhfnomkfpcebammhp[/url:1qj3jyjg]
[i:1qj3jyjg]To turn it on/off, click the button[/i:1qj3jyjg]
[img:1qj3jyjg]http://i56.photobucket.com/albums/g195/junkzm3/gaki/rikari5.png[/img:1qj3jyjg]
[img:1qj3jyjg]http://i56.photobucket.com/albums/g195/junkzm3/gaki/rikari6.png[/img:1qj3jyjg]
Here are examples of it in use:
[img:1qj3jyjg]http://i56.photobucket.com/albums/g195/junkzm3/gaki/rikai1.png[/img:1qj3jyjg]
[img:1qj3jyjg]http://i56.photobucket.com/albums/g195/junkzm3/gaki/rikari2.png[/img:1qj3jyjg]
[size=134:1qj3jyjg][b:1qj3jyjg]Press the Enter button while hovered over text to select other dictionaries installed (such as the names one)[/b:1qj3jyjg][/size:1qj3jyjg]
[img:1qj3jyjg]http://i56.photobucket.com/albums/g195/junkzm3/gaki/rikari3.png[/img:1qj3jyjg]
[img:1qj3jyjg]http://i56.photobucket.com/albums/g195/junkzm3/gaki/rikari4.png[/img:1qj3jyjg]