Vertical-align: middle - css

Question

I want to place the img element in the middle of div.partners-slider. This is a responsive slider i can't set fixed height. Any suggestions ?
jsfiddle
HTML
<div class="ps-wrap"><div class="partners-slider">
<div class="pslide"><img src="http://server-pps.com/img/gwiazda_sponsor.png" /></div>
<div class="pslide"><img src="http://www.sundance.org/images/support-us/HPActivitiesLogo50x50.png" /></div>
<div class="pslide"><img src="http://t2.gstatic.com/images?q=tbn:ANd9GcQvsT_kxUqdhOoo7zSTkbQ76PLgx4ZRucUZcbf2KsrY0bFbu30agw" /></div>
<div class="pslide"><img src="http://i.cdn.turner.com/dr/nba/teamsites-nbateams/release/nets/sites/nets/files/content/images-gallery/2013/07/twitterimage-updated.jpg?1374006700" /></div>
</div></div>
JS
$(document).ready(function() {
$('.partners-slider').bxSlider({
slideWidth: 924,
auto: 0,
autoStart: 0,
moveSlides: 1,
minSlides: 3,
maxSlides: 8,
pager: false,
slideMargin: 5
});
});
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e=parseInt(o.active.index)-1;r.goToSlide(e,"prev")}},r.startAuto=function(e){o.interval||(o.interval=setInterval(function(){"next"==o.settings.autoDirection?r.goToNextSlide():r.goToPrevSlide()},o.settings.pause),o.settings.autoControls&&1!=e&&q("stop"))},r.stopAuto=function(e){o.interval&&(clearInterval(o.interval),o.interval=null,o.settings.autoControls&&1!=e&&q("start"))},r.getCurrentSlide=function(){return o.active.index},r.getSlideCount=function(){return o.children.length},$("#main-content").resize(function(){r.redrawSlider()}),r.redrawSlider=function(){o.children.add(r.find(".bx-clone")).width(p()),o.viewport.css("height",h()),o.settings.ticker||m(),o.active.last&&(o.active.index=f()-1),o.active.index>=f()&&(o.active.last=!0),o.settings.pager&&!o.settings.pagerCustom&&(b(),M(o.active.index))},r.destroySlider=function(){o.initialized&&(o.initialized=!1,e(".bx-clone",this).remove(),o.children.removeAttr("style"),this.removeAttr("style").unwrap().unwrap(),o.controls.el&&o.controls.el.remove(),o.controls.next&&o.controls.next.remove(),o.controls.prev&&o.controls.prev.remove(),o.pagerEl&&o.pagerEl.remove(),e(".bx-caption",this).remove(),o.controls.autoEl&&o.controls.autoEl.remove(),clearInterval(o.interval))},r.reloadSlider=function(e){void 0!=e&&(s=e),r.destroySlider(),d()},d(),this}}})(jQuery),function(e,t){var i="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";e.fn.imagesLoaded=function(n){function s(){var t=e(g),i=e(h);a&&(h.length?a.reject(d,t,i):a.resolve(d)),e.isFunction(n)&&n.call(r,d,t,i)}function o(t,n){t.src===i||-1!==e.inArray(t,c)||(c.push(t),n?h.push(t):g.push(t),e.data(t,"imagesLoaded",{isBroken:n,src:t.src}),l&&a.notifyWith(e(t),[n,d,e(g),e(h)]),d.length===c.length&&(setTimeout(s),d.unbind(".imagesLoaded")))}var r=this,a=e.isFunction(e.Deferred)?e.Deferred():0,l=e.isFunction(a.notify),d=r.find("img").add(r.filter("img")),c=[],g=[],h=[];return e.isPlainObject(n)&&e.each(n,function(e,t){"callback"===e?n=t:a&&a[e](t)}),d.length?d.bind("load.imagesLoaded error.imagesLoaded",function(e){o(e.target,"error"===e.type)}).each(function(n,s){var r=s.src,a=e.data(s,"imagesLoaded");a&&a.src===r?o(s,a.isBroken):s.complete&&s.naturalWidth!==t?o(s,0===s.naturalWidth||0===s.naturalHeight):(s.readyState||s.complete)&&(s.src=i,s.src=r)}):s(),a?a.promise(r):r}}(jQuery);
CSS
img.tab-ico {
position: absolute;
left: 6px;
top: 50%;
margin-top: -12px;
}
.partners-slider {
height: 100%;
}
div.pslide {
text-align: center;
height: 100%;
}
div.pslide img {
vertical-align: middle;
}
.ps-wrap .bx-wrapper {
position: relative;
margin: auto 0;
padding: 0;
*zoom: 1;
}
.ps-wrap .bx-wrapper img {
max-width: 100%;
}
/** THEME
===================================*/
.ps-wrap .bx-wrapper .bx-viewport {
-moz-box-shadow: 0 0 5px #ccc;
-webkit-box-shadow: 0 0 5px #ccc;
box-shadow: 0 0 5px #ccc;
}
.ps-wrap {
position: relative;
margin-top: 18px;
background: #d6d4c8;
padding: 6px 0 6px;
}
.ps-wrap:before{
position: absolute;
top: 0;
left: 0;
height: 5px;
width: 100%;
content: '';
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAFCAYAAACEhIafAAAAJElEQVQImQEZAOb/AOXj1/8A5ePX/wDx7+L/ALy6sf8Az87C/97LEYJAFgv5AAAAAElFTkSuQmCC) repeat-x;
z-index: 1;
}
.ps-wrap:after{
position: absolute;
bottom: 0;
left: 0;
height: 5px;
width: 100%;
content: '';
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAFCAYAAACEhIafAAAAHklEQVQImWM4f+7Qf4Y9uzb+Z/j4/tF/hqePr0MIANUbEYIYiHfUAAAAAElFTkSuQmCC) repeat-x;
z-index: 1;
}
.bx-controls-direction {
position: absolute;
top: 80px;
}
.................................................................................

Answer 1

You can achieve that with an pseudo-element:
div.pslide {
text-align: center;
height: 100%;
}
div.pslide:before {
content:'';
display: inline-block;
height: 100%;
vertical-align: middle;
margin-right: -0.25em;
}
div.pslide img {
display: inline-block;
vertical-align: middle;
}
Example
How it works
Its based on this CSSTricks post.

Answer 2

Why are you keeping it has a separate image. Instead make it as the div's background like
style = "background:url('http://t2.gstatic.com/images?q=tbn:ANd9GcQvsT_kxUqdhOoo7zSTkbQ76PLgx4ZRucUZcbf2KsrY0bFbu30agw')
no-repeat center center"
and position it both vertically and horizontally.
Here is the sample fiddle of yours.