Show.slide help

http://takeyourbase.com
Here is my code:
$("img#down").show("slide", { direction: "up" }, 1000, function() {
$("img#up").show("slide", {direction: "down" }, 1000, function() {
$("#nav").slideDown(2000)
})
});
Not sure why this is happening. I'm pretty new to jQuery. Can anyone
provide some insight?
~switz
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