problems with my website!

Strange!!!
The menu on the left of my website is not showing up yesterday and this morning, on my home pc. I didn't touch the files on my server for quite some time. So, my conclusion was that it was not due to my itchy fingers. I have emailed to my web host - Yahoo this morning, trying out to figure out the reason for this. When I reach my gallery, the menu appears. Something wrong with my home pc? Or Yahoo has solved it?!!
I almost wanted to change server, if they don't solve it soon. Hahaha......This problem will make me lose some business deals, no joke!