Need help

i need a hand here…if you go to … http://zealous.halfwitted.com …go into the site and click on portfolio…i have photography and web drop down when logo is clicked…im trying to figure out how to make photography and web slide back up when either of them are clicked …kinda to close the logos and open up the other…i hope i explained it well enough… if you guys can give me a hand with that id appreciate it…thanks .jm