How to create a very simple accordion using mootools

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// Implement isHidden/isVisible methods into Element class
Element.implement({
    //Method to check if an element is hidden
    isHidden: function(){
        var w = this.offsetWidth, h = this.offsetHeight,
        force = (this.tagName === 'TR');
        return (w===0 && h===0 && !force) ? true : (w!==0 && h!==0 && !force) ? false : this.getStyle('display') === 'none';
    },
 
    // Method to check if an element is visible
    isVisible: function(){
        return !this.isHidden();
    }
});
 
window.addEvent('domready', function() {
    //Close all content blocks
    $('.zone').setStyle('display', 'none');
    //Add class 'active to the first tab, and show his content
    $('.accordion').getFirst('.title').addClass('active').getNext().setStyle('display', 'block');
 
    //Init the title click
    $('.title').addEvent('click', function(e){
        // Check if the content of the clicked title is hidden, if yes :
        if ( $(this).getNext().isHidden() ) {
            //Close content of the active title and remove the active class
            $('.title').removeClass('active').getNext().setStyle('display', 'none');
            //Add class 'active to the clicked title, and show his content
            $(this).toggleClass('active').getNext().setStyle('display', 'block');
        }
    });
});