How to hide horizontal tabs on page load? I have installed the field group module for horizontal tabs, so I can put several nodes in a tab via rendered node.

The question is simple: 

How can I hide these tabs on page load?
I want to show the links but only when the user clicks on it, the tab shows up.

Thank you for your collaboration.

Gael
Following @Janpan suggestion, I have hidden the tab content and then added a click function, so I have shown the rendered node inside the div. 

here the code:

 $("fieldset").hide();
                $(".tab a").click(function(){
                    $("fieldset").slideDown({
                        direction: "up"
                        }, 300);
                });