You aren't using an opacity filter to hide them until you hover.
:hover{filter:alpha(opacity=100);opacity:0.9} {filter:alpha(opacity=0);-moz-opacity: 0;opacity: 0;}
As for them not fitting, since you're using the column backgrounds you'll need to manually set the width of each section in the columns.

You aren't using an opacity filter to hide them until you hover. Ah, I see. Thank you! ^_^
You should alter that and change to a div bg hover.
I'm a little confused about ending the image.Also, how do I do a div bg hover? Sorry, my CSS knowledge is a little limited. ^_^;
Actually scratch the second part. The best method would be to reverse what you have. Instead of using the background with the closed tabs, re-edit it and save with the tabs fully open. Copy the closed tab images and save those as your column hover backgrounds.
