MAGENTO: Remotely trigger a Varien tab

js.js

Varien.Tabs = Class.create();
Varien.Tabs.prototype = {
  initialize: function(selector) {
    var self=this;
    $$(selector+' a').each(this.initTab.bind(this));
  },
 
  initTab: function(el) {
      el.href = 'javascript:void(0)';
      if ($(el.parentNode).hasClassName('active')) {
        this.showContent(el);
      }
      el.observe('click', this.showContent.bind(this, el));
  },
 
showContent: function(a) {
    var li = $(a.parentNode), ul = $(li.parentNode);
    ul.getElementsBySelector('li').each(function(el){
      var contents = $(el.id+'_contents');
      if (el==li) {
        el.addClassName('active');
        contents.show();
      } else {
        el.removeClassName('active');
        contents.hide();
      }
    });
  },
 
  remoteTabs: function(b) {
    var controlledLink = $$("#"+b+" a")[0];
    this.showContent(controlledLink);
  }
 
}
var csTablist = new Varien.Tabs('.tabs');

link.html

<a onclick="javascript:csTablist.remoteTabs('product_tabs_email');" href="javascript:void(0);">Link</a>