Short version question :
Is there navigator.mozIsLocallyAvailable equivalent function that works on all browsers, or an alternative?

Long version :)

Hi,
Here is my situation :
I want to implement an HtmlHelper extension for asp.net MVC that handle image post-loading easily (using jQuery).

So i render the page with empty image sources with the source specified in the alt attribute.
I insert image sources after the window.onload event, and it works great.

I did something like this :

$(window).bind('load', function() {

    var plImages = $(.postLoad);

    plImages.each(function() {

        $(this).attr(src, $(this).attr(alt));

    });

});

The problem is : After the first loading, post-loaded images are cached. But if the page takes 10 seconds to load, the cached post-loaded images will be displayed after this 10 seconds.

So i think to specify image sources on the document.ready event if the image is cached to display them immediatly.

I found this function : navigator.mozIsLocallyAvailable to check if an image is in the cache. Here is what I've done with jquery :

//specify cached image sources on dom ready

$(document).ready(function() {

    var plImages = $(.postLoad);

    plImages.each(function() {

        var source = $(this).attr(alt)

        var disponible = navigator.mozIsLocallyAvailable(source, true);

        if (disponible)

            $(this).attr(src, source);

    });

});



//specify uncached image sources after page loading

$(window).bind('load', function() {

        var plImages = $(.postLoad);

        plImages.each(function() {

        if ($(this).attr(src) == )

            $(this).attr(src, $(this).attr(alt));

    });

});

It works on Mozilla's DOM but it doesn't works on any other one. I tried navigator.isLocallyAvailable : same result.

Is there any alternative?