How to customize delay in this script?
<p>This piece of code appears to be responsible for an image slider on my website (it's currently not online). I would like to customize the delay between the slides. I tried changing the '5000' at the end to '10000', or '900000' or anything, but it has no effect whatsoever. What am I doing wrong?</p>

<pre><code>function slideSwitch() {
var $active = $('#slideshow IMG.active');

if ( $active.length == 0 ) $active = $('#slideshow IMG:last');

// use this to pull the images in the order they appear in the markup
   var $next = $active.next().length ? $active.next() : $('#slideshow IMG:first');
// uncomment the 3 lines below to pull the images in random order

// var $sibs  = $active.siblings();
// var rndNum = Math.floor(Math.random() * $sibs.length );
// var $next  = $( $sibs[ rndNum ] );


    $active.addClass('last-active');

    $next.css({opacity: 0.0})
    .addClass('active')
    .animate({opacity: 1.0}, 1500, function() {
        $active.removeClass('active last-active');
    });
}

$(function() {
    setInterval( "slideSwitch()", 5000 ); 
});
</code></pre>
