Défilement automatique avec jquery carousel

Bonjour,

J'ai utilisé pour mon site le jquery carousel pour faire défiler des images, seulement, comme je suis assez nul en javascript, je ne l'ai pas fait moi-même, je l'ai pris sur un autre site et j'ai modifié les css selon mes besoins, jusque là pas de problème.
Maintenant je voudrais que mes images défilent automatiquement sans qu'on ait besoin de cliquer à chaque fois. J'ai tenté, en suivant un tutoriel, de rajouter un timer mais je n'y suis pas arrivé.
Quelqu'un pourrait-il m'aider ?

Je mets ci-dessous mon fichier javascript :

(function($) {
var aux = {
// navigates left / right
navigate : function( dir, $el, $wrapper, opts, cache ) {

var scroll = opts.scroll,
factor = 1,
idxClicked = 0;

if( cache.expanded ) {
scroll = 1; // scroll is always 1 in full mode
factor = 3; // the width of the expanded item will be 3 times bigger than 1 collapsed item
idxClicked = cache.idxClicked; // the index of the clicked item
}

// clone the elements on the right / left and append / prepend them according to dir and scroll
if( dir === 1 ) {
$wrapper.find('div.ca-item:lt(' + scroll + ')').each(function(i) {
$(this).clone(true).css( 'left', ( cache.totalItems - idxClicked + i ) * cache.itemW * factor + 'px' ).appendTo( $wrapper );
});
}
else {
var $first = $wrapper.children().eq(0);

$wrapper.find('div.ca-item:gt(' + ( cache.totalItems - 1 - scroll ) + ')').each(function(i) {
// insert before $first so they stay in the right order
$(this).clone(true).css( 'left', - ( scroll - i + idxClicked ) * cache.itemW * factor + 'px' ).insertBefore( $first );
});
}

// animate the left of each item
// the calculations are dependent on dir and on the cache.expanded value
$wrapper.find('div.ca-item').each(function(i) {
var $item = $(this);
$item.stop().animate({
left : ( dir === 1 ) ? '-=' + ( cache.itemW * factor * scroll ) + 'px' : '+=' + ( cache.itemW * factor * scroll ) + 'px'
}, opts.sliderSpeed, opts.sliderEasing, function() {
if( ( dir === 1 && $item.position().left < - idxClicked * cache.itemW * factor ) || ( dir === -1 && $item.position().left > ( ( cache.totalItems - 1 - idxClicked ) * cache.itemW * factor ) ) ) {
// remove the item that was cloned
$item.remove();
}
cache.isAnimating = false;
});
});

},
// opens an item (animation) -> opens all the others
openItem : function( $wrapper, $item, opts, cache ) {
cache.idxClicked = $item.index();
// the item's position (1, 2, or 3) on the viewport (the visible items)
cache.winpos = aux.getWinPos( $item.position().left, cache );
$wrapper.find('div.ca-item').not( $item ).hide();
$item.find('div.ca-content-wrapper').css( 'left', cache.itemW + 'px' ).stop().animate({
width : cache.itemW * 2 + 'px',
left : cache.itemW + 'px'
}, opts.itemSpeed, opts.itemEasing)
.end()
.stop()
.animate({
left : '0px'
}, opts.itemSpeed, opts.itemEasing, function() {
cache.isAnimating = false;
cache.expanded = true;

aux.openItems( $wrapper, $item, opts, cache );
});

},
// opens all the items
openItems : function( $wrapper, $openedItem, opts, cache ) {
var openedIdx = $openedItem.index();

$wrapper.find('div.ca-item').each(function(i) {
var $item = $(this),
idx = $item.index();

if( idx !== openedIdx ) {
$item.css( 'left', - ( openedIdx - idx ) * ( cache.itemW * 3 ) + 'px' ).show().find('div.ca-content-wrapper').css({
left : cache.itemW + 'px',
width : cache.itemW * 2 + 'px'
});

// hide more link
aux.toggleMore( $item, false );
}
});
},
// show / hide the item's more button
toggleMore : function( $item, show ) {
( show ) ? $item.find('a.ca-more').show() : $item.find('a.ca-more').hide();
},
// close all the items
// the current one is animated
closeItems : function( $wrapper, $openedItem, opts, cache ) {
var openedIdx = $openedItem.index();

$openedItem.find('div.ca-content-wrapper').stop().animate({
width : '0px'
}, opts.itemSpeed, opts.itemEasing)
.end()
.stop()
.animate({
left : cache.itemW * ( cache.winpos - 1 ) + 'px'
}, opts.itemSpeed, opts.itemEasing, function() {
cache.isAnimating = false;
cache.expanded = false;
});

// show more link
aux.toggleMore( $openedItem, true );

$wrapper.find('div.ca-item').each(function(i) {
var $item = $(this),
idx = $item.index();

if( idx !== openedIdx ) {
$item.find('div.ca-content-wrapper').css({
width : '0px'
})
.end()
.css( 'left', ( ( cache.winpos - 1 ) - ( openedIdx - idx ) ) * cache.itemW + 'px' )
.show();

// show more link
aux.toggleMore( $item, true );
}
});
},
// gets the item's position (1, 2, or 3) on the viewport (the visible items)
// val is the left of the item
getWinPos : function( val, cache ) {
switch( val ) {
case 0 : return 1; break;
case cache.itemW : return 2; break;
case cache.itemW * 2 : return 3; break;
}
}
},
methods = {
init : function( options ) {

if( this.length ) {

var settings = {
sliderSpeed : 500, // speed for the sliding animation
sliderEasing : 'easeOutExpo',// easing for the sliding animation
itemSpeed : 500, // speed for the item animation (open / close)
itemEasing : 'easeOutExpo',// easing for the item animation (open / close)
scroll : 1 , // number of items to scroll at a time
};

return this.each(function() {

// if options exist, lets merge them with our default settings
if ( options ) {
$.extend( settings, options );
}

var $el = $(this),
$wrapper = $el.find('div.ca-wrapper'),
$items = $wrapper.children('div.ca-item'),
cache = {};

// save the with of one item
cache.itemW = $items.width();
// save the number of total items
cache.totalItems = $items.length;

// add navigation buttons
if( cache.totalItems > 3 )
$el.prepend('<div class="ca-nav"><span class="ca-nav-prev">Previous</span><span class="ca-nav-next">Next</span></div>')

// control the scroll value
if( settings.scroll < 1 )
settings.scroll = 1;
else if( settings.scroll > 3 )
settings.scroll = 3;

var $navPrev = $el.find('span.ca-nav-prev'),
$navNext = $el.find('span.ca-nav-next');

// hide the items except the first 3
$wrapper.css( 'overflow', 'hidden' );

// the items will have position absolute
// calculate the left of each item
$items.each(function(i) {
$(this).css({
position : 'absolute',
left : i * cache.itemW + 'px'
});
});




// click to open the item(s)
$el.find('a.ca-more').live('click.contentcarousel', function( event ) {
if( cache.isAnimating ) return false;
cache.isAnimating = true;
$(this).hide();
var $item = $(this).closest('div.ca-item');
aux.openItem( $wrapper, $item, settings, cache );
return false;
});

// click to close the item(s)
$el.find('a.ca-close').live('click.contentcarousel', function( event ) {
if( cache.isAnimating ) return false;
cache.isAnimating = true;
var $item = $(this).closest('div.ca-item');
aux.closeItems( $wrapper, $item, settings, cache );
return false;
});

// navigate left
$navPrev.bind('click.contentcarousel', function( event ) {
if( cache.isAnimating ) return false;
cache.isAnimating = true;
aux.navigate( -1, $el, $wrapper, settings, cache );
});

// navigate right
$navNext.bind('click.contentcarousel', function( event ) {
if( cache.isAnimating ) return false;
cache.isAnimating = true;
aux.navigate( 1, $el, $wrapper, settings, cache );
});

// adds events to the mouse
$el.bind('mousewheel.contentcarousel', function(e, delta) {
if(delta > 0) {
if( cache.isAnimating ) return false;
cache.isAnimating = true;
aux.navigate( -1, $el, $wrapper, settings, cache );
}
else {
if( cache.isAnimating ) return false;
cache.isAnimating = true;
aux.navigate( 1, $el, $wrapper, settings, cache );
}
return false;
});

});
}
}
};



$.fn.contentcarousel = function(method) {
if ( methods[method] ) {
return methods[method].apply( this, Array.prototype.slice.call( arguments, 1 ));
} else if ( typeof method === 'object' || ! method ) {
return methods.init.apply( this, arguments );
} else {
$.error( 'Method ' + method + ' does not exist on jQuery.contentcarousel' );
}
};

})(jQuery);