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Code có sử dụng tệp jQuery phiên bản 1.4.2. hãy gỡ bỏ nếu website của bạn đã có phiên bản cao hơn.

Code:

<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js'/></script>

<script type="text/javascript" >

$(function(){

$.fn.preloadify = function(options){

var defaults = {
delay:0,
imagedelay:0,
mode:"parallel",
preload_parent:"a",
check_timer:300,
ondone:function(){ },
oneachload:function(image){ },
fadein:700
};

// variables declaration and precaching images and parent container
var options = $.extend(defaults, options),
parent = $(this),
timer,i=0,j=options.imagedelay,counter=0,images = parent.find("img").css({display:"block",visibility:"hidden",opacity:0}),
check_flag = new Array(),
imagedelayer = function(image,time){

$(image).css("visibility","visible").delay(time).animate({opacity:1},options.fadein,function(){ $(this).parent().removeClass("preloader"); });

};

// add preloader to parent or wrap anchor depending on option
images.each(function(){

if($(this).parent(options.preload_parent).length==0)
$(this).wrap("<a class='preloader' />");
else
$(this).parent().addClass("preloader");

check_flag[i++] = false;

});

// convert into image array
images = $.makeArray(images);
counter = 0;

// function to show image
function showimage(i)
{
if(check_flag[i]==false)
{
counter++;
options.oneachload(images[i]);
check_flag[i] = true;
}

if(options.imagedelay==0&&options.delay==0)
$(images[i]).css("visibility","visible").animate({opacity:1},700);
else if(options.delay==0)
{
imagedelayer(images[i],j);
j += options.imagedelay;
}
else if(options.imagedelay==0)
{
imagedelayer(images[i],options.delay);

}
else
{
imagedelayer(images[i],(options.delay+j));
j += options.imagedelay;
}

}

// preload images parallel
function preload_parallel()
{
for(i=0;i<images.length;i++)
{
if(images[i].complete==true)
{
showimage(i);

}
}
}

// shows images based on index with respect to parent container
function preload_sequential()
{

if(images[i].complete==true)
{
showimage(i);
i++;
}
}

i=0;j=options.imagedelay;
// keep on checking after predefined time, if image is loaded
timer = setInterval(function(){

if(counter>=check_flag.length)
{
clearInterval(timer);
options.ondone();

return;
}

if(options.mode=="parallel")
preload_parallel();
else
preload_sequential();

},options.check_timer)
}
})
</script>


<script type="text/javascript">
$(function(){
$("#imagecode1k").preloadify({ imagedelay:500 });
$("#restart").click(function(e){
$("#imagecode1k").preloadify({ imagedelay:500 }); e.preventDefault();
});
});
</script>


<center>
<div id="imagecode1k"><div>
<a href="http://code1k.com"><img src="http://t2.gstatic.com/images?q=tbn:ANd9GcS3-VV6DDb5P9zBmJiP6dYXWk5av_OESPdD2czvuON49R5z2Lo&t=1&usg=__woQ5mePbk8zh8dK83aZuz6OTBHM=" /></a><br/>
<a href="http://code1k.com"><img src="http://t0.gstatic.com/images?q=tbn:ANd9GcSuRSLAdOS51DzPpQoP7JghtxsdmTgIqEVqcenVtehgI2lPvS4&t=1&usg=__4LomYDUyQfdndTtGdR7h17w8SqU=" /></a><br/>
<a href="http://code1k.com"><img src="http://t1.gstatic.com/images?q=tbn:ANd9GcTSWqlVcOxSp_oA3HMyQm3uJPjTEWmi6wrpzGm77lEol_5I_v0&t=1&usg=__HnhY4bOAUXnLqTT6qDBrMkCOIoM=" /></a><br/>
<a href="http://code1k.com"><img src="http://t3.gstatic.com/images?q=tbn:ANd9GcQAN9UFtUQaXNlMefwAsTGPw1JJX_4K3xEAjV7zoNtKkzs1PQQ&t=1&usg=__uAklv-W1DdskfnxvJtoaTeCvXLc=" /></a><br/>
<a href="http://code1k.com"><img src="http://t1.gstatic.com/images?q=tbn:ANd9GcQp9_aoU-_rECgHob0TpwsaNfGuCWcEZsPRyfphu-DsdMKvCEg&t=1&usg=__O7kT7W3BWG9596weLJ2aNbSaIeA=" /></a><br/>
<a href="http://code1k.com"><img src="http://t2.gstatic.com/images?q=tbn:ANd9GcRvGDmm0XjdOCD7-hoZL5cGNCj_HIIxenFjyq6xZjA99vOqA5E&t=1&usg=__h16x8Pomx3B8f-BHKhAnhKImJVw=" /></a><br/>
<a href="http://code1k.com"><img src="http://t0.gstatic.com/images?q=tbn:ANd9GcQDmcO_TGbjs2p3pBqtCO564pV4zYUp3R3fhH76mUn0BR2yvD4&t=1&usg=__PhLu4GTbDNRfv-QbKOBmi_J6AGM=" /></a><br/>
<a href="http://code1k.com"><img src="http://t1.gstatic.com/images?q=tbn:ANd9GcS3vpSXR5EqhifQvHCdm0Kpp9PXqsPQte6fD4aRBx8K7FUBX1I&t=1&usg=__nDr5AIACnmYPxmNBszrMubB3P0s=" /></a><br/>
<a href="http://code1k.com"><img src="http://t2.gstatic.com/images?q=tbn:ANd9GcS-Qz10qWzr763eYwCIRELbyeArw2vepYWHUokgra9RDJazd78&t=1&usg=__bcukFmmmxubPkHg-tvVH4N6Hl2g=" /></a><br/>

</div></div>

</center>

nguồn code 1k