On my site I have a calendar, but I can't make it so the image doesn't repeat itself when the date is shared with a more recent post... as in... I would prefer the calendar image disappear on earlier posts if they are all on the same day... any idea how I can do that?

To see what I am talking about my site is at: http://www.mightybuying.com

I tried no-repeat after the actual image URL... but that didn't work. Anyone have any ideas?