[Deff]

zaytsewa,
Замените скрипт

$(document).ready(function(){
$(".show_details").click(function(){
	var tr = $(this).parents('tr:first');
	var order_id = tr.find(".order_id").text();
	var details_tr = tr.next();
	
	if ( details_tr.is(":visible") )
		details_tr.hide();
	else
	{
		var details_td = tr.find(".details");
		if ( details_td.children().length == 0)
		{
			//$("#test").load("details.php?order_id="+order_id);
			details_td.load("details.php?order_id="+order_id);
			console.log("order_id="+order_id);
		}
		details_tr.show();
	}
});
});