Hover image shows only on "Home" page

I hate to ask this because I could swear that I came across this once before I had the problem but now I can't find it again. Please know that I do search the forum before posting and have gotten so much valuable info from it!! My problem is the image I use for hover on the %pages-center menu bar only shows when you are on the home page. I would like for it to show from any location. Is there a way to make that happen? The link is http://www.homeschoolshare.com/blog. While I'm at it here, any idea what I've done that causes the menu items to jump on hover? Thank you so much for all you guys do!