var currentlyOpen = 0;
$(document).ready(function(){
  $(".products .description").hide();
  $(".products .open .description").show();
  currentlyOpen = $(".products .open")[0];
  $(".products h3").click(function() {
    if (currentlyOpen) {
      $(currentlyOpen).removeClass('open');
      $('.description', currentlyOpen).hide('fast');
    }
    if (currentlyOpen == this.parentNode) {
      currentlyOpen = 0; 
    }
    else {
      currentlyOpen = this.parentNode;
      $(currentlyOpen).addClass('open');
      $('.description', currentlyOpen).show('fast');
    }
  })
});