To reproduce this bug, resize your browser window to 1/2 its normal size. Open a page in ebay which displays items (you can use the url provided above.) If the window is sized sufficiently small, a scroll bar will appear at the bottom of the window. The scroll bar appears not t be functional. When you scroll vertically, the scroll bar appears rendered above the rest of the page. Good Luck.
No repro on r24513, Safari 3.0.2, OS X Intel.
*** This bug has been marked as a duplicate of 11224 ***