if you expand all, browse off the page (go to forums) then go back to the main page all the deals are expanded still but the button says expand all,
http://a2.slickdeals.net/attachment.php?attachmentid=160635&stc=1&d=1231741709

when you hit it, it says collapse all and they all are already collapse ( the button is backwards)
http://a2.slickdeals.net/attachment.php?attachmentid=160633&stc=1&d=1231741709

this is in the current version of safari on leopard patched all the way.....