Browser Bookmarks - can't keep them in sight

[Mareid]

I know I'm supposed to move mouse cursor straight down the slider, but even when I do that, the bookmarks at the bottom of the page disappear before I can get my mouse there to click on them. These are the bookmarks that I need to use the slider on to see, the other ones are a little touchy but I can usually get to them. I'm sure there's something I am not doing correctly but I've tried it over and over and I cannot get it to work...Help Please!!