Overview is slow ? Then use Firefox and HTML5

[cristhiano]

With Firefox and HTML5, you can increase in 10x the speed of Overview.
So, apply this patch and enjoy.

(For IE users, make donations that I develop the script).

[Aly]

Description: those changes applies to the host, trigger names on top of the screen which by default are drawn using generated images. This patch removes images and draws vertical text with canvas.

For non IE users works fine.