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jQuery.attr('src') replace not working in FF

$("img[src*='libraries/phpthumb/phpThumbYT.php']").each(function(){

var t=$(this);

var src1= t.attr('src'); // initial src

var old_src = src1.substring(src1.lastIndexOf('media/'), src1.lenght);; // extract old source attr    

var media_id = old_src.substring(6,8); // extract media ID (directory name)

if ( old_src.indexOf("animation=1") != -1 )

{

    t.hover(function(){

        // on hover

        $(this).attr('src', 'libraries/phpthumb/phpThumbYT.php?w=131&h=92&far=C&iar=1&sfn=3&zc=C&f=gif&src=http://domain.name/media/'+media_id+'/preview.gif');  

    }, function(){

       // on rollout

        $(this).attr('src', src1);

    });

}

});

       

$("img[src*='libraries/phpthumb/phpThumbYT.php']").each(function(){

var t=$(this);

var src1= t.attr('src'); // initial src

var old_src = src1.substring(src1.lastIndexOf('media/')); // extract old source attr    

var media_id = old_src.substring(6,8); // extract media ID (directory name)

media_id = media_id.replace('/',''); // trim '/' from the end of media_id in case the ID is < 10

if ( old_src.indexOf("animation=1") != -1 )

{

    t.hover(function(){

        // on hover

        $(this).attr('src', 'libraries/phpthumb/phpThumbYT.php?w=131&h=92&far=C&iar=1&sfn=3&zc=C&f=gif&src=http://slovoprekazdeho.sk/media/'+media_id+'/preview.gif');  

    }, function(){

       // on rollout

        $(this).attr('src', src1);

    });

}

});