Yah...tat's becos the size of the pictures are 1024x768 and its larger than the area of the web browser. Unless viper programs it to let the picture to shrink to the size of the browser then you won't have to scroll right.
Well...I found something tat might explains tat.
Only in threads with Viper's post then it will need to scroll to the right
Cos the bottom part of Viper's post with the Now Playing thingy is too long it stretches towards almost the right part of the browser.