Why does my button disappear?

Head out to http://brucegust.com/kitchen_master/door_shop.php?door_id=555&product_id=826

Click on the "view cart" button. You'll get a pop up that shows you what's in the Cart. now click on "Continue Shopping" on that pop up.

At that point, the screen background disappears, the popup goes away and...

...the "view cart" button should re-appear and it doesn't.

Here's my Javascript (starting on line 170):

$("#menu_toggle_option").click(function(e){
		e.preventDefault();
		//alert("ajax_2.php");
		$('#sidebar_content').load('ajax.php?session_id=<?php echo $session_id;?>');
		$("#wrapper").toggleClass("menuDisplayed");
		$('#show_cart_button').show();
		$("#select_option").show();
		$(".button").show();
		$(".modal-content").hide();
		$('#screen').hide();
		return false;
		 //alert("The paragraph was clicked.");
	});

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I'm going nuts! What am I missing? I need that button to be visible after the popup is closed.

Thanks!