how to center align an image inside the JavaScript Image Slider

Question

i have created a slide show with JavaScript ,the resolution set for the frame is 960x540 but when i insert images into the slider it align automatically to the left,how can i align the image inside the slider to the center,and is there any way to automatically align the images even if the images are not exactly the resolution of the slider.This is the basic code i used.

 <style type="text/css">

#sliderFrame {position:relative;width:960px;margin: 0 auto 40px;}

#slider {
    width:960px;height:540px;/* Make it the same size as your images */
 background:#fff url(http://4.bp.blogspot.com/-aVGCcclfKQo/UR-T3vxFAMI/AAAAAAAABm8/ncwIfUdoLIw/s1600/loading.gif) no-repeat 50% 50%;
 position:relative;
 margin:0 auto;/*make the image slider center-aligned */
    box-shadow: 0px 1px 5px #999999;
}
#slider img {
 position:absolute;
 border:none;
 display:none;
}

/* the link style (if an image is wrapped in a link) */
#slider a.imgLink {
 z-index:2;
 display:none;position:absolute;
 top:0px;left:0px;border:0;padding:0;margin:0;
 width:100%;height:100%;
}

/* Caption styles */
div.mc-caption-bg, div.mc-caption-bg2 {
 position:absolute;
 width:100%;
 height:auto;
 padding:0;
 left:0px; 
 bottom:15px;
 z-index:3;
 overflow:hidden;
 font-size: 0;
}
div.mc-caption-bg {
 background-color:black;
}
div.mc-caption {
 font: bold 14px/20px Arial;
 color:#EEE;
 z-index:4;
 padding:10px 0;
 text-align:center;
}
div.mc-caption a {
 color:#FB0;
}
div.mc-caption a:hover {
 color:#DA0;
}


/* ------ built-in navigation bullets wrapper ------*/
div.navBulletsWrapper  {
 top:500px; left:280px; /* Its position is relative to the #slider */
 width:150px;
 background:none;
 padding-left:20px;
 position:relative;
 z-index:5;
 cursor:pointer;
}

/* each bullet */
div.navBulletsWrapper div 
{
    width:11px; height:11px;
    background:transparent url(http://3.bp.blogspot.com/-ZUaX5-lcCi4/UR-TzMXcpuI/AAAAAAAABm0/kokxtfFdNcU/s1600/bullet.png) no-repeat 0 0;
    float:left;overflow:hidden;vertical-align:middle;cursor:pointer;
    margin-right:11px;/* distance between each bullet*/
    _position:relative;/*IE6 hack*/
}
div.navBulletsWrapper div.active {background-position:0 -11px;}
.intro {
    bottom: 0;
    color: rgba(0, 0, 0, 0.2);
    font-size: 16px;
    position: absolute;
    right: 0;
    text-decoration: none;
    z-index: 99999;
}
/* --------- Others ------- */
#slider 
{
 transform: translate3d(0,0,0);
    -ms-transform:translate3d(0,0,0);
    -moz-transform:translate3d(0,0,0);
    -o-transform:translate3d(0,0,0);
}
</style>
<script src="http://project.dimpost.com/image-slider/js-image-slider-1.js" type="text/javascript"></script>
<script src="http://project.dimpost.com/image-slider/js-image-slider-2.js" type="text/javascript"></script>

Answer 1

As I understand you can add

left: 50%;

to your CSS rule with "#slider img" selector and add some JavaScript to set negative margin to the images that equals half of the image width, for example (using jQuery):

$("#slider img").each(function () {
    $(this).css("margin-left", -this.width / 2);
})