How to hide Bootstrap previous modal when you opening new one?

I have such trouble: I have authentification which is made using Bootstrap modals.

When user opens sign in modal he can go to sign up modal ( or other ) . So, I need to close previous one.

Now I'm closing them like this:

$(document).ready(function(){
  $("a").click(function() {
  $("#login").hide();
  $("#sign_up").hide();
 })  
});

but when I'm doing this - I can't reopen sign in modal( after click on sign up from sign in) until I refresh the page.

Can someone suggest how to check on what modal I'm clicking on the link and close it, when call another one ? Is there any universal way to close previous modal ?