Double click issue with Accordion

Double click issue with Accordion

Hi, I am transferring a website from HTML to Joomla 1.5. Everything works fine except the accordion which has one problem: while on the html page each hidden content slides down with a single click, in Joomla it requires two clicks. I have mantained the same scripts, apart from the jQuery libraries plugin, which I found among the Joomla Extensions (Joomla has MooTools enabled by default).

Here is the old HTML site and here is the new one in Joomla.

Here is the Accordion script I am using:

  1. jQuery(function($) {
    $('.contentPane').hide();
    $('.headPane').toggle(function(){
    track($(this).children('.accrocheImg').children('img').attr('alt'));
    //var chapitre = $(this).children('.accrocheImg').children('img').attr('alt');
    //track(chapitre);
    }, function(){});
    $('.headPane').click(function() {
    $(this).next('.contentPane').slideToggle('slow');
    $(this).children('.accrocheTxt').toggleClass('accrocheTxtOpen');
    });
    $('.headPane').hover(function () {
    $(this).children('.accrocheImg').children('img').addClass("survolimg");
    }, function () {
    $(this).children('.accrocheImg').children('img').removeClass("survolimg");
    });
    });