Add "Jump to Top" and "Jump to Bottom" buttons

[rebelsheart]

Title
Add "Jump to Top" and "Jump to Bottom" buttons

Short, concise description of the idea
Implement a "jump to top" button similar the the one present on most Tumblr blogs. Also implement a "jump to bottom" button.

Full description of the idea
Tumblr is essentially a graphics-heavy Twitter - which is to say it has a different purpose and function in life than LiveJournal. Many of their design elements would be inappropriate here. However, I think that the "jump to top" button that appears when you've begun to scroll down a Tumblr blog or dashboard would be wildly helpful.

Along the same lines, a "jump to bottom" button would also be helpful on freinds pages, allowing users to quickly determine if they need to go back another page to see if there are more entries they should read since the last time they looked.
An ordered list of benefits

• faster navigation

An ordered list of problems/issues involved

• I am unsure if Tumblr's implementation is friendly to those using screen readers and mobile devices.