Fuhh, thanks goodness. i have done with my own design of "back to top" image
so, for those who interested,
i give it for free. xDD
Take it, or leave it :p
For those who still don't have the code for back to top button.
i can share you the one that i use.
But please noted that,
*This code is isn't mine. and i'm just sharing it here.
For more code and css tutorial , feel free to visit www.abushaleh.net.
copy and paste to Dashboard-->design-->add gadget-->html.
Remember to put the image code on the appropriate place
save and you're done !